CN111724821A - disk unit - Google Patents

Abstract

Embodiments provide a magnetic disk device capable of enlarging a data area. A magnetic disk device of an embodiment includes: a disk unit having a magnetic disk, a magnetic head including a write head and a read head arranged apart from the write head by a predetermined distance in a rotational direction of the magnetic disk, and a preamplifier including a1 st circuit for generating a recording current for writing data to the magnetic disk by the write head and a2 nd circuit for amplifying an output reproduced from the magnetic disk by the read head; and a control unit for causing the preamplifier to execute a process of generating a recording current to be written by the write head to the magnetic disk and a process of receiving an output reproduced by the read head from the magnetic disk. In the preamplifier, a process of reading data from the magnetic disk by the read head is executed in parallel with a process of writing data transferred from the control section to the magnetic disk by the write head.

Description

Translated fromChinese

磁盘装置disk unit

本申请享受以日本专利申请2019-49910号(申请日：2019年3月18日)和日本专利申请2019-153707号(申请日：2019年8月26日)为基础申请的优先权。本申请通过参照该基础申请而包含基础申请的全部内容。This application enjoys priority based on Japanese Patent Application No. 2019-49910 (filing date: March 18, 2019) and Japanese Patent Application No. 2019-153707 (filing date: August 26, 2019). The present application includes the entire contents of the basic application by referring to the basic application.

技术领域technical field

实施方式涉及磁盘装置。Embodiments relate to magnetic disk devices.

背景技术Background technique

在磁盘装置中，已知有如下的技术：记录并再现预先决定的特殊图形来计测每个头的头间隙间隔，基于与计测到的每个头的头间隙间隔相当的时间差，按每个头改变数据的记录开始定时而进行补偿。In a magnetic disk device, a technique is known that records and reproduces a predetermined special pattern, measures the head gap interval for each head, and changes the head gap interval for each head based on a time difference corresponding to the measured head gap interval for each head. Compensation is performed at the start timing of data recording.

磁盘装置的读取/写入通过磁头来进行。该磁头中包括从磁盘读取数据的读取头和向磁盘写入数据的写入头。该读取头及写入头在磁盘的旋转方向上错开，离开预定距离地配置。在此，在利用写入头向磁盘写入着数据时，也需要利用读取头从磁盘读取伺服数据，所以，一般地，在数据的读取开始之前使数据的写入停止。因而，存在无法作为数据区域而使用的区域。Reading/writing of the magnetic disk device is performed by the magnetic head. The magnetic head includes a read head for reading data from the disk and a write head for writing data to the disk. The read head and the write head are shifted in the rotational direction of the magnetic disk and are arranged apart from each other by a predetermined distance. Here, when data is written to the magnetic disk by the write head, it is necessary to read the servo data from the magnetic disk by the read head. Therefore, generally, the data writing is stopped before the data reading is started. Therefore, there are areas that cannot be used as data areas.

发明内容SUMMARY OF THE INVENTION

本发明的实施方式提供能够扩大数据区域的磁盘装置。Embodiments of the present invention provide a magnetic disk device capable of expanding a data area.

一实施方式所涉及的磁盘装置具备磁盘部和控制部。磁盘部具有：磁盘；磁头，包括写入头和在所述磁盘的旋转方向上从所述写入头离开预定距离地配置的读取头；以及前置放大器，具有：生成向所述磁盘利用所述写入头写入数据的记录电流的第1电路、和将从所述磁盘利用所述读取头再现了的信号放大的第2电路。控制部使所述前置放大器执行：生成用于所述写入头向所述磁盘写入的记录电流的处理和接收从所述磁盘利用所述读取头再现了的信号的处理。在所述前置放大器中，与利用所述写入头向所述磁盘写入从所述控制部传送的数据的处理并行地，执行利用所述读取头从所述磁盘读取数据的处理。The magnetic disk apparatus according to one embodiment includes a magnetic disk unit and a control unit. The magnetic disk unit includes: a magnetic disk; a magnetic head including a write head and a read head arranged at a predetermined distance from the write head in the rotational direction of the magnetic disk; and a preamplifier having: A first circuit for recording current for writing data by the write head, and a second circuit for amplifying a signal reproduced from the magnetic disk by the read head. The control unit causes the preamplifier to perform a process of generating a recording current for writing by the write head to the magnetic disk and a process of receiving a signal reproduced from the magnetic disk by the read head. In the preamplifier, a process of reading data from the magnetic disk by the read head is performed in parallel with the process of writing the data transferred from the control unit to the magnetic disk by the write head .

附图说明Description of drawings

图1是示出本发明的第1实施方式所涉及的磁盘装置的概略的构成的一例的图。FIG. 1 is a diagram showing an example of a schematic configuration of a magnetic disk device according to the first embodiment of the present invention.

图2是示出该实施方式所涉及的R/W通道及前置放大器的构成一例的图。FIG. 2 is a diagram showing an example of the configuration of the R/W channel and the preamplifier according to the embodiment.

图3是示出该实施方式中的磁头与记录于磁盘的数据的关系的一例的图。FIG. 3 is a diagram showing an example of the relationship between the magnetic head and the data recorded on the magnetic disk in the embodiment.

图4是用于说明该实施方式所涉及的数据区域的扩展处理的图。FIG. 4 is a diagram for explaining the expansion processing of the data area according to this embodiment.

图5是示出该实施方式所涉及的数据区域的扩展处理的一例的流程图。FIG. 5 is a flowchart showing an example of the expansion process of the data area according to this embodiment.

图6是示出该实施方式所涉及的处理的比较的一例的图。FIG. 6 is a diagram showing an example of a comparison of the processing according to the embodiment.

图7是示出该实施方式的变形例所涉及的处理的比较的一例的图。FIG. 7 is a diagram showing an example of comparison of processing according to a modification of the embodiment.

图8是示出本发明的第2实施方式所涉及的磁盘装置的概略的构成的一例的图。8 is a diagram showing an example of a schematic configuration of a magnetic disk device according to a second embodiment of the present invention.

图9是示出该实施方式所涉及的R/W通道及前置放大器的构成一例的图。FIG. 9 is a diagram showing an example of the configuration of the R/W channel and the preamplifier according to the embodiment.

图10是示出该实施方式中的磁头与记录于磁盘的数据的关系的一例的图。FIG. 10 is a diagram showing an example of the relationship between the magnetic head and the data recorded on the magnetic disk in this embodiment.

图11是用于说明该实施方式所涉及的数据区域的扩展处理的图。FIG. 11 is a diagram for explaining the expansion processing of the data area according to this embodiment.

图12是示出该实施方式所涉及的数据区域的扩展处理的一例的流程图。FIG. 12 is a flowchart showing an example of the expansion process of the data area according to this embodiment.

图13是示出该实施方式所涉及的处理的比较的一例的图。FIG. 13 is a diagram showing an example of comparison of the processing according to the embodiment.

图14是示出第3实施方式所涉及的数据区域的扩展处理的一例的流程图。FIG. 14 is a flowchart showing an example of expansion processing of the data area according to the third embodiment.

图15是示出第4实施方式所涉及的R/W通道及前置放大器的构成一例的图。FIG. 15 is a diagram showing an example of the configuration of the R/W channel and the preamplifier according to the fourth embodiment.

图16是示出第5实施方式所涉及的R/W通道及前置放大器的构成一例的图。FIG. 16 is a diagram showing an example of the configuration of the R/W channel and the preamplifier according to the fifth embodiment.

图17是示出该实施方式所涉及的R/W通道及前置放大器的构成一例的图。FIG. 17 is a diagram showing an example of the configuration of the R/W channel and the preamplifier according to the embodiment.

图18是示出该实施方式所涉及的R/W通道及前置放大器的构成一例的图。FIG. 18 is a diagram showing an example of the configuration of the R/W channel and the preamplifier according to the embodiment.

具体实施方式Detailed ways

以下，参照附图对实施方式进行说明。此外，公开只不过是一例，发明不受以下的实施方式所记载的内容所限定。本领域技术人员能够容易地想到的变形当然包含于公开的范围。为了使说明更加清楚，在附图中，有时也将各部分的大小、形状等相对于实际的实施形态进行变更而示意性地表示。在多个附图中，有时也对对应的要素标注相同的参照数字，省略详细的说明。Hereinafter, embodiments will be described with reference to the drawings. In addition, the disclosure is merely an example, and the invention is not limited by the contents described in the following embodiments. Modifications that can be easily conceived by those skilled in the art are of course included in the scope of the disclosure. In order to make the description clearer, in the drawings, the size, shape, and the like of each part may be changed and schematically shown with respect to the actual embodiment. In a plurality of drawings, the same reference numerals may be attached to corresponding elements, and detailed descriptions may be omitted.

(第1实施方式)(first embodiment)

图1是示出磁盘装置100的概略的构成的一例的图。FIG. 1 is a diagram showing an example of a schematic configuration of amagnetic disk device 100 .

如图1所示，磁盘装置100具备盘部110和控制部130。盘部110具备磁盘111、主轴马达(以下，称作“SPM”)112、磁头113、音圈马达(以下，称作“VCM”)116、以及前置放大器117。磁头113具有写入头114及读取头115。另外，控制部130具备片上系统(以下，称作“SOC”)131、伺服组件(以下，称作“SVC”)135、以及存储器136。SOC(控制部)131通过将CPU132、硬盘控制器(以下，称作“HDC”)133、作为处理部的R/W(读取/写入)通道134设置于1个芯片而构成。存储器136具备ROM137、RAM138。另外，前置放大器117与R/W通道134由包括设定读取头115读取的信号的激活(active)/省电的省电信号线在内的多个信号线139连接。此外，省电信号的激活/省电的指示从HDC133经由R/W通道134而向前置放大器117发送。As shown in FIG. 1 , themagnetic disk device 100 includes adisk unit 110 and acontrol unit 130 . Thedisk unit 110 includes amagnetic disk 111 , a spindle motor (hereinafter, referred to as “SPM”) 112 , amagnetic head 113 , a voice coil motor (hereinafter, referred to as “VCM”) 116 , and apreamplifier 117 . Themagnetic head 113 has a writehead 114 and a readhead 115 . In addition, thecontrol unit 130 includes a system on chip (hereinafter, referred to as “SOC”) 131 , a servo pack (hereinafter, referred to as “SVC”) 135 , and amemory 136 . The SOC (control unit) 131 is configured by providing aCPU 132, a hard disk controller (hereinafter, referred to as "HDC") 133, and an R/W (read/write)channel 134 as a processing unit in one chip. Thememory 136 includes aROM 137 and aRAM 138 . In addition, thepreamplifier 117 and the R/W channel 134 are connected by a plurality ofsignal lines 139 including a power saving signal line for setting the active/power saving of the signal read by thepickup 115 . In addition, the activation/power saving instruction of the power saving signal is sent from theHDC 133 to thepreamplifier 117 via the R/W channel 134 .

磁盘111例如形成为圆板状，具有由非磁性体形成的基板。在基板的各表面，作为基底层，层叠有由呈现软磁特性的材料形成的软磁性层，在该软磁性层的上层部，层叠有在相对于盘面垂直的方向上具有磁各向异性的磁记录层，在该磁记录层的上层部，层叠有保护膜层。在此，将磁头113的方向作为上层。Themagnetic disk 111 is formed in a disk shape, for example, and has a substrate formed of a non-magnetic material. On each surface of the substrate, as a base layer, a soft magnetic layer made of a material exhibiting soft magnetic properties is laminated, and on the upper part of the soft magnetic layer, a magnetic anisotropy in a direction perpendicular to the disk surface is laminated. The magnetic recording layer has a protective film layer laminated on the upper portion of the magnetic recording layer. Here, the direction of themagnetic head 113 is taken as the upper layer.

磁盘111固定于主轴马达(SPM)112，通过该SPM112而以预定的速度旋转。此外，不限于1张，也可以将多张磁盘111设置于SPM112。SPM112通过从SVC135供给的驱动电流(或驱动电压)而驱动。Themagnetic disk 111 is fixed to a spindle motor (SPM) 112 , and is rotated at a predetermined speed by theSPM 112 . In addition, it is not limited to one, and a plurality ofmagnetic disks 111 may be provided in theSPM 112 . TheSPM 112 is driven by the drive current (or drive voltage) supplied from theSVC 135 .

磁头113在前端部具备滑块113a，并具有形成于滑块113a的写入头114及读取头115(参照图3)。磁头113根据磁盘111的张数而设置多个。Themagnetic head 113 includes aslider 113a at the front end portion, and has a writehead 114 and a read head 115 (see FIG. 3 ) formed on theslider 113a. A plurality ofmagnetic heads 113 are provided according to the number ofmagnetic disks 111 .

VCM116设置成使在前端部具有磁头113的致动器转动自如。通过利用VCM116使致动器转动，磁头113向磁盘111的所希望的轨道上移动并定位。VCM116通过从SVC135供给的驱动电流(或驱动电压)而驱动。The VCM 116 is provided so that the actuator having themagnetic head 113 at the front end is rotatable. By rotating the actuator with theVCM 116, themagnetic head 113 is moved and positioned on a desired track of themagnetic disk 111. TheVCM 116 is driven by the drive current (or drive voltage) supplied from theSVC 135 .

前置放大器117将与从R/W通道134供给的写入数据相应的写入信号(写入电流)向写入头114供给。另外，前置放大器117将从读取头115输出了的读取信号放大并向R/W通道134传输。Thepreamplifier 117 supplies thewrite head 114 with a write signal (write current) corresponding to the write data supplied from the R/W channel 134 . In addition, thepreamplifier 117 amplifies the read signal output from the readhead 115 and transmits it to the R/W channel 134 .

CPU132是磁盘装置100的主控制器，执行盘部110的读取/写入动作的控制及磁头113的定位所需的伺服控制。TheCPU 132 is the main controller of themagnetic disk apparatus 100 , and executes control of the read/write operation of thedisk unit 110 and servo control required for positioning of themagnetic head 113 .

R/W通道134是处理与读出(read)/写进(write)相关联的信号的信号处理电路。R/W通道134包括执行读取数据的信号处理的读取通道和执行写入数据的信号处理的写入通道。R/W通道134将读取信号变换为数字数据，由数字数据解调读取数据。R/W通道134将从HDC133传送的写入数据编码，将编码后的写入数据向前置放大器117传送。The R/W channel 134 is a signal processing circuit that processes signals associated with read/write. The R/W channel 134 includes a read channel that performs signal processing of read data and a write channel that performs signal processing of write data. The R/W channel 134 converts the read signal into digital data, and demodulates the read data from the digital data. The R/W channel 134 encodes the write data transmitted from theHDC 133 , and transmits the encoded write data to thepreamplifier 117 .

HDC133控制经由磁头113、前置放大器117、R/W通道134及CPU132进行的向磁盘111的数据的写入和从磁盘111的数据的读出。HDC133与磁盘装置100构成主机的接口，执行读取数据及写入数据的传送控制。即，HDC133作为接收从主机传送的信号且向主机传送信号的主机接口控制器而发挥功能。在向主机传送信号的情况下，HDC133执行遵从CPU132利用磁头113读出并解调后的再现信号的数据的纠错处理。另外，HDC133接收从主机传送的命令(写入命令、读取命令等)，并将接收到的命令向CPU132发送。TheHDC 133 controls the writing of data to themagnetic disk 111 and the reading of data from themagnetic disk 111 via themagnetic head 113 , thepreamplifier 117 , the R/W channel 134 , and theCPU 132 . TheHDC 133 forms a host interface with themagnetic disk device 100, and performs transfer control of read data and write data. That is, theHDC 133 functions as a host interface controller that receives a signal transmitted from the host and transmits the signal to the host. In the case of transmitting a signal to the host, theHDC 133 executes error correction processing according to the data of the reproduced signal read and demodulated by theCPU 132 using themagnetic head 113 . In addition,HDC 133 receives commands (write commands, read commands, etc.) transmitted from the host, and transmits the received commands toCPU 132 .

SVC135遵从CPU132的控制而控制SPM112和VCM116的驱动。通过SPM112和VCM116驱动，磁头113的位置向磁盘111上的目标轨道抵达。TheSVC 135 controls the driving of theSPM 112 and theVCM 116 in accordance with the control of theCPU 132 . Driven by theSPM 112 and theVCM 116 , the position of themagnetic head 113 is reached toward the target track on themagnetic disk 111 .

存储器136包括作为非易失性存储器的ROM137及作为易失性存储器的RAM138。存储器136保存CPU132的处理所需的程序及参数。Thememory 136 includes aROM 137 as a nonvolatile memory and aRAM 138 as a volatile memory. Thememory 136 stores programs and parameters necessary for processing by theCPU 132 .

图2是示出R/W通道134及前置放大器117的构成的一例的图。FIG. 2 is a diagram showing an example of the configuration of the R/W channel 134 and thepreamplifier 117 .

如图2所示，R/W通道134具备解调电路(第3电路)134a、记录信号生成电路(第4电路)134b。另外，前置放大器117具备放大电路(第2电路)117a、记录电流生成电路(第1电路)117b。解调电路134a解调从放大电路117a传送的再现波形。记录信号生成电路134b向记录电流生成电路17b传送记录信号。放大电路117a将利用读取头115从磁盘111再现了的信号放大。记录电流生成电路117b生成利用写入头114向磁盘111写入数据的记录电流。此外，在图2中，省略了解调电路134a与放大电路117a的连接线及记录信号生成电路134b与记录电流生成电路117b的连接线以外的连接线。As shown in FIG. 2 , the R/W channel 134 includes a demodulation circuit (third circuit) 134a and a recording signal generation circuit (fourth circuit) 134b. In addition, thepreamplifier 117 includes an amplifier circuit (second circuit) 117a and a recording current generation circuit (first circuit) 117b. Thedemodulation circuit 134a demodulates the reproduced waveform transmitted from theamplification circuit 117a. The recordingsignal generating circuit 134b transmits the recording signal to the recordingcurrent generating circuit 17b. Theamplifier circuit 117 a amplifies the signal reproduced from themagnetic disk 111 by thepickup 115 . The recordingcurrent generation circuit 117 b generates a recording current for writing data to themagnetic disk 111 by thewrite head 114 . In addition, in FIG. 2, connection lines other than the connection line between thedemodulation circuit 134a and theamplifier circuit 117a and the connection line between the recordingsignal generation circuit 134b and the recordingcurrent generation circuit 117b are omitted.

读取头115从磁盘111读出了的数据作为读取信号，经由放大电路117a、解调电路134a而从盘部110向控制部130传送。另外，写入信号从控制部130经由记录信号生成电路134b、记录电流生成电路117b而向盘部110的写入头114传送。The data read from themagnetic disk 111 by the readhead 115 is transmitted as a read signal from thedisk unit 110 to thecontrol unit 130 via theamplifier circuit 117a and thedemodulation circuit 134a. In addition, the write signal is transmitted from thecontrol unit 130 to thewrite head 114 of thedisk unit 110 via the recordingsignal generating circuit 134b and the recordingcurrent generating circuit 117b.

而且，R/W通道134与前置放大器117由省电信号线连接(参照图1)，R/W通道134能够基于CPU132的指示而将省电信号向前置放大器117发送。另外，在本实施方式中，CPU132能够调整使省电信号成为ON/OFF的定时。在此，所谓调整，是确保用于从空闲状态或睡眠模式转变为读取模式的瞬变(Transient)时间，例如，是实际上在使伺服选通成为有效的定时的预定时间前使省电信号成为无效。另外，也能够调整使省电信号成为有效的定时。在此，所谓调整，是确保用于取得伺服信号波形至最后的时间，例如，是实际上在使伺服选通成为无效的定时的预定时间后使省电信号成为有效。另外，若考虑到产生电路延迟，则也可以考虑使省电信号的无效的定时的调整在实际上使伺服选通成为有效的定时的预定时间前。而且，CPU132也可以使得：使省电信号成为无效/有效的定时的调整与实际上使伺服选通成为有效/无效的定时一致。这样的调整，通过预先在存储器136内准备多个调整的模式，例如CPU132根据向R/W通道134传送的数据的状况而适当设定模式，从而来控制R/W通道134、前置放大器117。The R/W channel 134 and thepreamplifier 117 are connected by a power saving signal line (see FIG. 1 ), and the R/W channel 134 can transmit the power saving signal to thepreamplifier 117 based on an instruction from theCPU 132 . In addition, in the present embodiment, theCPU 132 can adjust the timing of turning on/off the power saving signal. Here, the adjustment refers to securing a transient time for transitioning from the idle state or the sleep mode to the read mode, for example, to actually save power before a predetermined time before the timing when the servo strobe is activated. Signal becomes invalid. In addition, the timing at which the power saving signal becomes active can also be adjusted. Here, the adjustment is to secure the time for obtaining the waveform of the servo signal to the end, for example, to enable the power saving signal after a predetermined time of the timing at which the servo strobe is actually disabled. In addition, considering the occurrence of circuit delay, it may be considered that the timing for deactivating the power saving signal is adjusted before a predetermined time period when the servo strobe is actually activated. Furthermore, theCPU 132 may make the adjustment of the timing to disable/enable the power saving signal coincide with the timing to enable/disable the servo strobe actually. For such adjustment, a plurality of adjustment modes are prepared in thememory 136 in advance. For example, theCPU 132 controls the R/W channel 134 and thepreamplifier 117 by appropriately setting the mode according to the state of the data transmitted to the R/W channel 134 . .

图3是示出磁头113与记录于磁盘111的数据的关系的一例的图。FIG. 3 is a diagram showing an example of the relationship between themagnetic head 113 and data recorded on themagnetic disk 111 .

如图3所示，构成磁头113的前端部的滑块13a位于磁盘111的上侧。滑块113a包括写入头114及读取头115。另外，在磁盘111记录作为用户数据的数据D1和用于进行磁头113在磁盘111上的定位的伺服数据D2。此外，磁盘11的旋转方向如箭头所示为图示左侧。As shown in FIG. 3 , theslider 13 a constituting the front end portion of themagnetic head 113 is positioned above themagnetic disk 111 . Theslider 113 a includes awrite head 114 and aread head 115 . In addition, data D1 as user data and servo data D2 for positioning themagnetic head 113 on themagnetic disk 111 are recorded on themagnetic disk 111 . In addition, the rotation direction of themagnetic disk 11 is the left side of the figure as shown by the arrow.

写入头114与读取头115在磁盘111的旋转方向上离开预定距离(以下，也称作“头间隙”)。因而，在不执行参照图4、图5进行说明的数据区域的扩展处理的情况下，需要在读取头15读取伺服数据D2的定时使写入头14的数据的写入结束，产生没能活用头间隙之间的数据区域的状态。Thewrite head 114 and theread head 115 are separated from each other by a predetermined distance (hereinafter, also referred to as "head gap") in the rotational direction of themagnetic disk 111 . Therefore, when the data area expansion process described with reference to FIGS. 4 and 5 is not performed, it is necessary to complete the writing of the data by thewrite head 14 at the timing when the readhead 15 reads the servo data D2, and no error occurs. The state of the data area between header gaps can be utilized.

接着，参照图4及图5对数据区域的扩展处理进行说明。Next, the expansion processing of the data area will be described with reference to FIGS. 4 and 5 .

图4是用于说明数据区域的扩展处理的图，图5是示出数据区域扩展处理的一例的流程图。FIG. 4 is a diagram for explaining the expansion processing of the data area, and FIG. 5 is a flowchart showing an example of the expansion processing of the data area.

在图4上侧，示出了再现信号RD的波形、伺服选通信号SG、写入选通信号WG、省电信号的波形。再现信号RD的波形是以前置放大器17将以读取头15从磁盘111读取到的输出放大后的波形。伺服选通信号SG是用于为了解调伺服信号而确定对伺服数据进行读取的位置的信号。在伺服选通信号SG为ON时读取伺服数据。写入选通信号WG是用于确定利用写入头14向磁盘111写入数据的位置的信号。在写入选通信号WG为ON时向磁盘写入数据。省电信号PWR_SAVE是使前置放大器17的放大电路17a成为OFF的信号。更具体地说，在省电信号PWR_SAVE为OFF时放大电路117a成为ON，所以以读取头115读取到的波形的输出被放大，再现信号RD被从前置放大器117a输出。另外，在省电信号PWR_SAVE为ON时，放大电路117a成为OFF，所以以读取头115读取到的波形的输出不被放大，再现信号RD不被从前置放大器117a输出。On the upper side of FIG. 4 , the waveforms of the reproduction signal RD, the servo strobe signal SG, the write strobe signal WG, and the power saving signal are shown. The waveform of the reproduction signal RD is a waveform obtained by thepreamplifier 17 amplifying the output read from themagnetic disk 111 by thepickup 15 . The servo strobe signal SG is a signal for determining the position at which the servo data is read in order to demodulate the servo signal. Servo data is read when the servo strobe signal SG is ON. The write gate signal WG is a signal for determining the position where data is written to themagnetic disk 111 by thewrite head 14 . Data is written to the disk when the write strobe signal WG is ON. The power saving signal PWR_SAVE is a signal for turning OFF theamplifier circuit 17a of thepreamplifier 17 . More specifically, since theamplifier circuit 117a is turned ON when the power saving signal PWR_SAVE is OFF, the output of the waveform read by thepickup 115 is amplified, and the reproduced signal RD is output from thepreamplifier 117a. In addition, when the power saving signal PWR_SAVE is ON, theamplifier circuit 117a is turned OFF, so the output of the waveform read by thepickup 115 is not amplified, and the reproduced signal RD is not output from thepreamplifier 117a.

在图4的下侧，示意性地示出位于位置P1的滑块113a沿着图示的箭头时间上地转变至位置P2的状态。此外，位于位置P1的滑块113a以虚线示出，位于位置P2的滑块113a以实线示出。另外，头间隙W1表示写入头114与读取头115的距离。On the lower side of FIG. 4 , a state in which theslider 113 a at the position P1 is temporally transited to the position P2 along the arrow in the figure is schematically shown. In addition, theslider 113a at the position P1 is shown with a broken line, and theslider 113a at the position P2 is shown with a solid line. In addition, the head gap W1 represents the distance between thewrite head 114 and theread head 115 .

接着，一边参照图4及图5，一边对数据区域的扩展处理的作用进行说明。该数据区域的扩展处理通过R/W通道234接收CPU132的指示并从R/W通道234向前置放大器117发送而执行。Next, the operation of the data area expansion process will be described with reference to FIG. 4 and FIG. 5 . The expansion processing of this data area is performed by the R/W channel 234 receiving an instruction from theCPU 132 and sending it from the R/W channel 234 to thepreamplifier 117 .

如图5所示，在数据写入的开始后(ST1：是)，判定读取头115是否位于对伺服数据D2进行读取的伺服位置(ST2)。在判定为位于伺服位置的情况下(ST2：是)，使伺服选通成为有效，伺服选通信号SG成为ON(ST3)。此时，滑块113a位于图4的位置P1，读取头115位于位置TC1。另外，写入头14的位置处于按头间隙W1的量离开的位置。而且，省电信号PWR_SAVE在读取头115位于位置TC1的定时成为OFF，前置放大器117的放大电路117a动作，以读取头115读取到的波形的输出被放大，从前置放大器117输出再现信号RD(也就是伺服数据)。此时，写入选通信号WG保持着有效，所以，继续进行向磁盘111的数据的写入。As shown in FIG. 5 , after the start of data writing ( ST1 : YES), it is determined whether or not the readhead 115 is at the servo position for reading the servo data D2 ( ST2 ). When it is determined that it is at the servo position ( ST2 : YES), the servo strobe is enabled, and the servo strobe signal SG is turned on ( ST3 ). At this time, theslider 113a is located at the position P1 in FIG. 4, and thepickup 115 is located at the position TC1. In addition, the position of thewrite head 14 is a position separated by the head gap W1. Then, the power saving signal PWR_SAVE is turned OFF at the timing when thepickup 115 is positioned at the position TC1, theamplifier circuit 117a of thepreamplifier 117 operates, and the output of the waveform read by thepickup 115 is amplified and output from thepreamplifier 117 The reproduced signal RD (that is, the servo data) is reproduced. At this time, since the write gate signal WG is kept active, the writing of data to themagnetic disk 111 is continued.

返回图5继续说明。当如已经描述那样伺服选通成为有效后(ST3)，伺服数据D2被读取(ST4)。接着，判定数据的写入是否结束(ST5)，若判定为数据的写入未结束(ST5：否)，则伺服数据D2的读取继续(ST4)，若判定为数据的写入结束(ST5：是)，则使写入选通成为无效(ST6)。此时，滑块113a位于图4的P2，读取头115位于位置TC2，并且，写入头114位于位置TC1。另外，伺服选通保持着有效，所以，继续伺服数据D2的读取，但是，写入选通成为无效，所以，数据的写入结束。Return to FIG. 5 to continue the description. When the servo strobe becomes active as already described (ST3), the servo data D2 is read (ST4). Next, it is determined whether the writing of data is completed ( ST5 ), if it is determined that the writing of data is not completed ( ST5 : NO), the reading of the servo data D2 is continued ( ST4 ), and if it is determined that the writing of data is completed ( ST5 ) : YES), the write strobe is disabled (ST6). At this time, theslider 113a is located at P2 in FIG. 4, theread head 115 is located at the position TC2, and thewrite head 114 is located at the position TC1. In addition, since the servo strobe remains active, the reading of the servo data D2 is continued, but the write strobe becomes inactive, so that the writing of the data is completed.

如图4所示，在相当于头间隙W1的、从位置TC1到位置TC2，写入选通成为有效，且伺服选通也成为有效。因而，在数据的写入中，能够读取伺服数据D2。因此，在不使用本实施方式的构成的情况下，为了读取伺服数据D2，在使伺服选通成为有效的位置之前结束数据的写入，但是，在本实施方式中，能够使相当于头间隙W1的、从位置TC1到位置TC2，成为能够写入数据的数据扩展区域W2。As shown in FIG. 4 , from the position TC1 to the position TC2 corresponding to the head gap W1, the write strobe is enabled, and the servo strobe is also enabled. Therefore, during data writing, the servo data D2 can be read. Therefore, when the configuration of this embodiment is not used, in order to read the servo data D2, the writing of data is terminated before the position where the servo strobe is enabled. However, in this embodiment, the head can be The gap W1 from the position TC1 to the position TC2 is a data extension area W2 in which data can be written.

图6是将进行参照图4、图5说明的处理的情况(情形S12)和不进行该处理的情况(情形S11)作为比较的一例而示出的图。在图6的上侧示出情形S11，在下侧示出情形S12。FIG. 6 is a diagram showing, as an example of comparison, a case where the processing described with reference to FIGS. 4 and 5 is performed (case S12 ) and a case where the processing is not performed (case S11 ). The case S11 is shown on the upper side of FIG. 6 , and the case S12 is shown on the lower side.

首先，说明情形S11的情况。在读取头115的位置成为位置TC1的定时使写入选通成为无效，结束数据的写入。此时，写入头14的位置位于靠前相当于头间隙W1处。像这样，在情形S11的情况下，以不并行地进行数据的写入和数据的读取的方式进行控制，所以，处于头间隙W1的区域无法作为数据区域而使用的状态。First, the case of the case S11 will be described. When the position of the readhead 115 becomes the position TC1, the write strobe is deactivated, and the writing of data is terminated. At this time, the position of thewrite head 14 is located in the front corresponding to the head gap W1. As described above, in the case of the case S11, the data writing and the data reading are controlled not to be performed in parallel, so that the area of the head gap W1 cannot be used as a data area.

接着，说明情形S12的情况。与省电信号PWR_SAVE在位置TC1成为OFF同时地，使伺服选通也成为有效。由此，以读取头115读取到的波形的输出以放大电路117a放大并从前置放大器117输出。在情形S12的情况下，即使能够像这样进行数据的读取，也不使写入选通成为无效，使数据的写入继续。然后，在磁盘111的旋转进行而读取头15的位置位于位置TC2时，写入选通成为无效，数据的写入结束。也就是说，相当于头间隙W1的、从位置TC1到位置TC2之间，在数据的写入中并行地执行伺服数据的读取。通过这样做，能够使从位置TC1到位置TC2成为能够写入数据的数据扩展区域W2。由此，在情形S12的情况下，能够减少像情形S11那样无法作为数据区域而活用的磁盘111的区域。Next, the case of the case S12 will be described. At the same time as the power saving signal PWR_SAVE is turned OFF at the position TC1, the servo strobe is also enabled. Thereby, the output of the waveform read by thepickup 115 is amplified by theamplifier circuit 117 a and output from thepreamplifier 117 . In the case of the case S12, even if the data can be read in this way, the write strobe is not deactivated, and the data write is continued. Then, when the rotation of themagnetic disk 111 progresses and the position of the readhead 15 is at the position TC2, the write strobe is disabled, and the writing of data is completed. That is, between the position TC1 and the position TC2 corresponding to the head gap W1, the reading of the servo data is performed in parallel with the writing of the data. By doing so, it is possible to make the data extension area W2 from the position TC1 to the position TC2 into which data can be written. Thereby, in the case of the case S12, it is possible to reduce the area of themagnetic disk 111 that cannot be utilized as a data area as in the case S11.

如以上说明那样，根据本实施方式的磁盘装置100，通过在数据的写入中读取伺服数据D2，在设计数据格式时，能够确保并行地进行数据的写入和数据的读取的数据扩展区域W2，能够扩展能够对于磁盘111进行数据处理的区域。As described above, according to themagnetic disk device 100 of the present embodiment, by reading the servo data D2 during data writing, it is possible to ensure data expansion in which data writing and data reading are performed in parallel when designing a data format. The area W2 can expand the area in which data processing can be performed on themagnetic disk 111 .

(变形例)(Variation)

图7说明在数据扩展区域W2写入伺服数据D2而非用户数据D1的情况下的作用。图7的上侧示出已经描述的情形S12，在该图的下侧示出本变形例的情形S13。FIG. 7 illustrates the action in the case where the servo data D2 is written in the data extension area W2 instead of the user data D1. The upper side of FIG. 7 shows the situation S12 already described, and the lower side of the figure shows the situation S13 of the present modification.

说明情形S13的情况。由于向数据扩展区域W2写入伺服数据D2，所以，与情形S12的情况相比较，在数据写入中，按与数据扩展区域W2(换言之，为头间隙W1)相当的时间量提前地开始读取。此时，写入选通成为有效，数据的写入继续。并且，虽然伺服选通成为有效，但是，在经过了与头间隙W1相当的时间量时，换言之，在读取头115位于位置TD2时，写入选通成为无效。若像这样构成，则磁盘装置100能够将数据扩展区域W2作为预先写入伺服数据的区域而使用。能够扩大能够写入伺服数据D2的区域，进而，能够增多伺服数据D2的数据量或者使写入数据的间距充分宽，所以，磁盘装置100能够提高读取伺服数据D2的精度。The case of the case S13 will be described. Since the servo data D2 is written to the data extension area W2, in the data writing, the reading is started earlier by an amount of time corresponding to the data extension area W2 (in other words, the head gap W1) as compared with the case of the case S12 Pick. At this time, the write strobe becomes active, and data writing continues. Further, although the servo strobe is enabled, the write strobe is disabled when a time amount corresponding to the head gap W1 has elapsed, in other words, when theread head 115 is positioned at the position TD2. With this configuration, themagnetic disk device 100 can use the data extension area W2 as an area in which servo data is written in advance. The area in which the servo data D2 can be written can be enlarged, and the data volume of the servo data D2 can be increased or the pitch of the written data can be made sufficiently wide, so that themagnetic disk device 100 can improve the accuracy of reading the servo data D2.

此外，在上述实施方式中，以在省电信号PWR_SAVE为OFF的定时伺服选通信号SG也成为ON的情况进行了说明，但是，定时不限于此。例如，也可以设想即便使省电信号PWR_SAVE成为ON也发生电路延迟等而放大电路117a不立即动作的情况。在此，可以考虑使得：使省电信号PWR_SAVE成为OFF的定时比使伺服选通信号SG成为ON的定时早。若像这样使省电信号PWR_SAVE的定时错开，则也可以设想如后述的图11所示，在读取伺服数据D2之前稍微读取用户数据的情况。关于这样的数据，例如也可以考虑通过滤波处理等而将用户数据除去。In addition, in the above-mentioned embodiment, the case where the servo strobe signal SG is also turned ON at the timing when the power saving signal PWR_SAVE is OFF has been described, but the timing is not limited to this. For example, even if the power saving signal PWR_SAVE is turned on, a circuit delay or the like occurs and theamplifier circuit 117a does not operate immediately. Here, it can be considered that the timing at which the power saving signal PWR_SAVE is turned OFF is earlier than the timing at which the servo strobe signal SG is turned ON. If the timing of the power saving signal PWR_SAVE is shifted in this way, as shown in FIG. 11 to be described later, it is conceivable that the user data is read slightly before the servo data D2 is read. With regard to such data, for example, it is conceivable to remove user data by filtering or the like.

另外，在上述实施方式中，以头间隙W1的时间与数据扩展区域W2的时间一致的情况进行了说明，但是，未必一致。也可以考虑由于电路延迟等而如后述的图11那样地数据扩展区域W2变长的情况。In addition, in the above-mentioned embodiment, the case where the time of the head gap W1 and the time of the data extension area W2 are matched has been described, but they do not necessarily match. It is also conceivable that the data extension area W2 becomes longer due to a circuit delay or the like, as shown in FIG. 11 to be described later.

在以下的第2实施方式中，说明使省电信号PWR_SAVE成为OFF的定时比伺服选通信号SG也成为ON的定时早而数据扩展区域W2变长的情况下的一方式。此外，第1实施方式的再现信号RD对应于图11等的再现信号(写入时)。再现信号(读取时)是与写入时的比较，为了参考而记载。而且，以下的第3实施方式～第5实施方式的说明能够应用于第1实施方式的磁盘装置100及以下说明的磁盘装置1。In the following second embodiment, an embodiment will be described in which the timing at which the power saving signal PWR_SAVE is turned OFF is earlier than the timing at which the servo strobe signal SG is also turned ON, and the data extension area W2 becomes longer. Note that the reproduced signal RD of the first embodiment corresponds to the reproduced signal (at the time of writing) of FIG. 11 and the like. The reproduced signal (at the time of reading) is compared with that at the time of writing, and is described for reference. Furthermore, the following descriptions of the third to fifth embodiments can be applied to themagnetic disk apparatus 100 of the first embodiment and the magnetic disk apparatus 1 described below.

(第2实施方式)(Second Embodiment)

图8是示出磁盘装置1的概略的构成的一例的图。FIG. 8 is a diagram showing an example of a schematic configuration of the magnetic disk device 1 .

如图8所示，磁盘装置1具备盘部10和控制部30。盘部10具备磁盘11、主轴马达(以下，称作“SPM”)12、磁头13、音圈马达(以下，称作“VCM”)16、前置放大器17。磁头13具有写入头14及读取头15。另外，控制部30具备片上系统(以下，称作“SOC”)31、伺服组件(以下，称作“SVC”)35、存储器36。SOC(控制部)31通过将CPU32、硬盘控制器(以下，称作“HDC”)33、作为处理部的R/W(读取/写入)通道34设置于1个芯片而构成。存储器36具备ROM37、RAM38。另外，前置放大器17与R/W通道34由包括设定读取头15所读取的信号的激活/省电的省电信号线在内的多个信号线39连接。此外，省电信号的激活/省电的指示从HDC33经由R/W通道34而向前置放大器17发送。As shown in FIG. 8 , the magnetic disk device 1 includes adisk unit 10 and acontrol unit 30 . Thedisk unit 10 includes amagnetic disk 11 , a spindle motor (hereinafter, referred to as “SPM”) 12 , amagnetic head 13 , a voice coil motor (hereinafter, referred to as “VCM”) 16 , and apreamplifier 17 . Themagnetic head 13 has awrite head 14 and aread head 15 . In addition, thecontrol unit 30 includes a system-on-chip (hereinafter, referred to as “SOC”) 31 , a servo pack (hereinafter, referred to as “SVC”) 35 , and amemory 36 . The SOC (control unit) 31 is configured by providing aCPU 32, a hard disk controller (hereinafter, referred to as "HDC") 33, and an R/W (read/write)channel 34 as a processing unit on one chip. Thememory 36 includes aROM 37 and aRAM 38 . In addition, thepreamplifier 17 and the R/W channel 34 are connected by a plurality ofsignal lines 39 including a power saving signal line for setting activation/power saving of the signal read by thepickup 15 . In addition, the activation/power saving instruction of the power saving signal is transmitted from theHDC 33 to thepreamplifier 17 via the R/W channel 34 .

磁盘11例如形成为圆板状，具有由非磁性体形成的基板。在基板的各表面，作为基底层，层叠有由呈现软磁特性的材料形成的软磁性层，在该软磁性层的上层部，层叠有在相对于盘面垂直的方向上具有磁各向异性的磁记录层，在该磁记录层的上层部，层叠有保护膜层。在此，将磁头13的方向作为上层。Themagnetic disk 11 is formed in a disk shape, for example, and has a substrate formed of a non-magnetic material. On each surface of the substrate, as a base layer, a soft magnetic layer made of a material exhibiting soft magnetic properties is laminated, and on the upper part of the soft magnetic layer, a magnetic anisotropy in a direction perpendicular to the disk surface is laminated. The magnetic recording layer has a protective film layer laminated on the upper portion of the magnetic recording layer. Here, the direction of themagnetic head 13 is taken as the upper layer.

磁盘11固定于主轴马达(SPM)12，通过该SPM12而以预定的速度旋转。此外，不限于1张，也可以将多张磁盘11设置于SPM12。SPM12通过从SVC35供给的驱动电流(或驱动电压)而驱动。Themagnetic disk 11 is fixed to a spindle motor (SPM) 12 , and is rotated at a predetermined speed by theSPM 12 . In addition, it is not limited to one, and a plurality ofmagnetic disks 11 may be provided in theSPM 12 . TheSPM 12 is driven by the drive current (or drive voltage) supplied from theSVC 35 .

磁头13在前端部具备滑块13a，并具有形成于滑块13a的写入头14及读取头15(参照图10)。磁头13根据磁盘11的张数而设置多个。Themagnetic head 13 includes aslider 13a at a front end portion, and includes awrite head 14 and a read head 15 (see FIG. 10 ) formed on theslider 13a. A plurality ofmagnetic heads 13 are provided according to the number ofmagnetic disks 11 .

VCM16设置成使在前端部具有磁头13的致动器转动自如。通过利用VCM16使致动器转动，磁头13向磁盘11的所希望的轨道上移动、定位。VCM16通过从SVC35供给的驱动电流(或驱动电压)而驱动。TheVCM 16 is provided so that the actuator having themagnetic head 13 at the distal end is rotatable. Themagnetic head 13 is moved and positioned on a desired track of themagnetic disk 11 by rotating the actuator by theVCM 16 . TheVCM 16 is driven by the drive current (or drive voltage) supplied from theSVC 35 .

前置放大器17将与从R/W通道34供给的写入数据相应的写入信号(写入电流)向写入头14供给。另外，前置放大器17将从读取头15输出的读取信号放大并向R/W通道34传输。Thepreamplifier 17 supplies thewrite head 14 with a write signal (write current) corresponding to the write data supplied from the R/W channel 34 . In addition, thepreamplifier 17 amplifies the read signal output from the readhead 15 and transmits it to the R/W channel 34 .

CPU32是磁盘装置1的主控制器，执行盘部10的读取/写入动作的控制及磁头13的定位所需的伺服控制。TheCPU 32 is the main controller of the magnetic disk device 1 , and executes control of the read/write operation of thedisk unit 10 and servo control necessary for positioning of themagnetic head 13 .

R/W通道34是处理与读出(read)/写进(write)相关联的信号的信号处理电路。R/W通道34包括执行读取数据的信号处理的读取通道和执行写入数据的信号处理的写入通道。R/W通道34将读取信号变换为数字数据，由数字数据解调读取数据。R/W通道34将从HDC33传送的写入数据编码，将编码后的写入数据向前置放大器17传送。The R/W channel 34 is a signal processing circuit that processes signals associated with read/write. The R/W channel 34 includes a read channel that performs signal processing of read data and a write channel that performs signal processing of write data. The R/W channel 34 converts the read signal into digital data, and demodulates the read data from the digital data. The R/W channel 34 encodes the write data transmitted from theHDC 33 , and transmits the encoded write data to thepreamplifier 17 .

HDC33控制：经由磁头13、前置放大器17、R/W通道34及CPU32进行的向磁盘11的数据的写入和从磁盘11的数据的读出。HDC33与磁盘装置1构成主机的接口，执行读取数据及写入数据的传送控制。即，HDC33作为接收从主机传送的信号且向主机传送信号的主机接口控制器而发挥功能。在向主机传送信号的情况下，HDC33执行：遵从CPU32利用磁头13读出并解调后的再现信号的数据的纠错处理。另外，HDC33接收从主机传送的命令(写入命令、读取命令等)，并将接收到的命令向CPU32发送。TheHDC 33 controls: the writing of data to themagnetic disk 11 and the reading of data from themagnetic disk 11 via themagnetic head 13 , thepreamplifier 17 , the R/W channel 34 , and theCPU 32 . TheHDC 33 and the magnetic disk device 1 constitute a host interface, and perform transfer control of read data and write data. That is, theHDC 33 functions as a host interface controller that receives a signal transmitted from the host and transmits the signal to the host. In the case of transmitting a signal to the host, theHDC 33 executes error correction processing of the data of the reproduced signal read and demodulated by theCPU 32 using themagnetic head 13 . In addition, theHDC 33 receives commands (write commands, read commands, etc.) transmitted from the host, and transmits the received commands to theCPU 32 .

SVC35遵从CPU32的控制而控制SPM12和VCM16的驱动。通过SPM12和VCM16驱动，磁头13的位置向磁盘11上的目标轨道抵达。TheSVC 35 controls the driving of theSPM 12 and theVCM 16 in accordance with the control of theCPU 32 . Driven by theSPM 12 and theVCM 16, the position of themagnetic head 13 is reached toward the target track on themagnetic disk 11.

存储器36包括作为非易失性存储器的ROM37及作为易失性存储器的RAM38。存储器36保存CPU32的处理所需的程序及参数。Thememory 36 includes aROM 37 as a nonvolatile memory and aRAM 38 as a volatile memory. Thememory 36 stores programs and parameters necessary for processing by theCPU 32 .

图9是示出R/W通道34及前置放大器17的构成的一例的图。FIG. 9 is a diagram showing an example of the configuration of the R/W channel 34 and thepreamplifier 17 .

如图9所示，R/W通道34具备解调电路(第3电路)34a、记录信号生成电路(第4电路)34b。另外，前置放大器17具备放大电路(第2电路)17a、记录电流生成电路(第1电路)17b。解调电路34a解调从放大电路17a传送的再现波形。记录信号生成电路34b向记录电流生成电路17b传送记录信号。放大电路17a将利用读取头15从磁盘11再现了的信号放大。记录电流生成电路17b生成利用写入头14向磁盘11写入数据的记录电流。此外，在图9中，省略了解调电路34a与放大电路17a的连接线及记录信号生成电路34b与记录电流生成电路17b的连接线以外的连接线。As shown in FIG. 9 , the R/W channel 34 includes a demodulation circuit (third circuit) 34a and a recording signal generation circuit (fourth circuit) 34b. In addition, thepreamplifier 17 includes an amplifier circuit (second circuit) 17a and a recording current generation circuit (first circuit) 17b. Thedemodulation circuit 34a demodulates the reproduced waveform transmitted from theamplifier circuit 17a. The recordingsignal generating circuit 34b transmits the recording signal to the recordingcurrent generating circuit 17b. Theamplifier circuit 17 a amplifies the signal reproduced from themagnetic disk 11 by thepickup 15 . The recordingcurrent generation circuit 17 b generates a recording current for writing data to themagnetic disk 11 by thewrite head 14 . In addition, in FIG. 9, the connection lines other than the connection line between thedemodulation circuit 34a and theamplifier circuit 17a and the connection line between the recordingsignal generation circuit 34b and the recordingcurrent generation circuit 17b are omitted.

读取头15从磁盘11读出的数据作为读取信号，经由放大电路17a、解调电路34a而从盘部10向控制部30传送。另外，写入信号从控制部30经由记录信号生成电路34b、记录电流生成电路17b而向盘部10的写入头14传送。The data read from themagnetic disk 11 by the readhead 15 is transmitted as a read signal from thedisk unit 10 to thecontrol unit 30 via theamplifier circuit 17a and thedemodulation circuit 34a. In addition, the write signal is transmitted from thecontrol unit 30 to thewrite head 14 of thedisk unit 10 via the recordingsignal generating circuit 34b and the recordingcurrent generating circuit 17b.

而且，R/W通道34与前置放大器17由省电信号线连接(参照图8)，R/W通道34能够基于CPU32的指示而将省电信号向前置放大器17发送。另外，在本实施方式中，CPU32能够调整使省电信号成为ON/OFF的定时。在此，所谓调整，是确保用于从空闲状态或睡眠模式转变为读取模式的瞬变时间，例如，是实际上在使伺服选通成为有效的定时的预定时间前使省电信号成为无效。另外，也能够调整使省电信号成为有效的定时。在此，所谓调整，是确保用于取得伺服信号波形至最后的时间，例如，是实际上在使伺服选通成为无效的定时的预定时间后使省电信号成为有效。另外，若考虑到产生电路延迟，则也可以考虑使省电信号的无效的定时的调整实际上在使伺服选通成为有效的定时的预定时间前。而且，CPU32也可以使得：使省电信号成为无效/有效的定时的调整与实际上使伺服选通成为有效/无效的定时一致。这样的调整，通过预先在存储器36内准备多个调整的模式，例如CPU32根据向R/W通道34传送的数据的状况而适当设定模式，从而来控制R/W通道34、前置放大器17。The R/W channel 34 and thepreamplifier 17 are connected by a power saving signal line (see FIG. 8 ), and the R/W channel 34 can transmit the power saving signal to thepreamplifier 17 based on an instruction from theCPU 32 . In addition, in the present embodiment, theCPU 32 can adjust the timing at which the power saving signal is turned ON/OFF. Here, the adjustment refers to securing a transient time for transitioning from the idle state or the sleep mode to the read mode, for example, deactivating the power saving signal for a predetermined time before the timing at which the servo strobe is actually activated. . In addition, the timing at which the power saving signal becomes active can also be adjusted. Here, the adjustment is to secure the time for obtaining the waveform of the servo signal to the end, for example, to enable the power saving signal after a predetermined time of the timing at which the servo strobe is actually disabled. In addition, in consideration of the occurrence of circuit delay, it may be considered that the adjustment of the timing for deactivating the power saving signal is actually a predetermined time before the timing for validating the servo strobe. Furthermore, theCPU 32 may make the adjustment of the timing to disable/enable the power saving signal coincide with the timing to actually enable/disable the servo strobe. For such adjustment, a plurality of adjustment patterns are prepared in thememory 36 in advance. For example, theCPU 32 controls the R/W channel 34 and thepreamplifier 17 by appropriately setting the pattern according to the state of the data transmitted to the R/W channel 34 . .

图10是示出磁头13与记录于磁盘11的数据的关系的一例的图。FIG. 10 is a diagram showing an example of the relationship between themagnetic head 13 and data recorded on themagnetic disk 11 .

如图10所示，构成磁头13的前端部的滑块13a位于磁盘11的上侧。滑块13a包括写入头14及读取头15。另外，在磁盘11记录作为用户数据的数据D1和用于进行磁头13在磁盘11上的定位的伺服数据D2。此外，磁盘11的旋转方向如箭头所示为图示左侧。As shown in FIG. 10 , theslider 13 a constituting the front end portion of themagnetic head 13 is positioned above themagnetic disk 11 . Theslider 13 a includes awrite head 14 and aread head 15 . In addition, data D1 as user data and servo data D2 for positioning themagnetic head 13 on themagnetic disk 11 are recorded on themagnetic disk 11 . In addition, the rotation direction of themagnetic disk 11 is the left side of the figure as shown by the arrow.

写入头14与读取头15离开预定距离(以下，也称作“头间隙”)。因而，在不执行参照图11、图12说明的数据区域的扩展处理的情况下，需要在读取头15读取伺服数据D2的定时使写入头14的数据的写入结束，产生没能活用头间隙之间的数据区域的状态。Thewrite head 14 and the readhead 15 are separated from each other by a predetermined distance (hereinafter, also referred to as "head gap"). Therefore, when the data area expansion process described with reference to FIGS. 11 and 12 is not performed, it is necessary to complete the writing of data by thewrite head 14 at the timing when the readhead 15 reads the servo data D2, and a failure occurs. The status of the data area between header gaps is utilized.

接着，参照图11及图12对数据区域的扩展处理进行说明。Next, expansion processing of the data area will be described with reference to FIGS. 11 and 12 .

图11是用于说明数据区域的扩展处理的图，图12是示出数据区域扩展处理的一例的流程图。FIG. 11 is a diagram for explaining the expansion processing of the data area, and FIG. 12 is a flowchart showing an example of the expansion processing of the data area.

在图11中，分别示出了再现信号(写入时)的波形、再现信号(读取时)的波形、伺服选通信号SG、写入选通信号WG、作为使省电成为无效/有效的信号的PWR_SAVE信号。再现信号的波形是以前置放大器17将以读取头15再现了的输出放大后的波形。伺服选通信号SG是用于为了解调伺服信号而确定伺服位置的信号。写入选通信号WG是用于确定利用写入头14写入数据的位置的信号。省电信号PWR_SAVE是使前置放大器17的放大电路17a成为OFF的信号。另外，图11示意性地示出位于位置P1的滑块13a沿着图示的箭头移动至位置P2的状态。此外，位于位置P1的滑块13a以虚线示出，位于位置P2的滑块13a以实线示出。另外，头间隙W1表示写入头14与读取头15的距离。In FIG. 11, the waveform of the reproduced signal (at the time of writing), the waveform of the reproduced signal (at the time of reading), the servo strobe signal SG, the write strobe signal WG, as the power saving ineffective/effective are shown, respectively. Signal the PWR_SAVE signal. The waveform of the reproduced signal is a waveform obtained by amplifying the output reproduced by thepickup 15 by thepreamplifier 17 . The servo strobe signal SG is a signal for determining the servo position for demodulating the servo signal. The write gate signal WG is a signal for determining a position where data is written by thewrite head 14 . The power saving signal PWR_SAVE is a signal for turning OFF theamplifier circuit 17a of thepreamplifier 17 . 11 schematically shows a state in which theslider 13a located at the position P1 has moved to the position P2 along the arrow shown in the figure. In addition, theslider 13a at the position P1 is shown with a broken line, and theslider 13a at the position P2 is shown with a solid line. In addition, the head gap W1 represents the distance between thewrite head 14 and the readhead 15 .

接着，一边参照图11及图12，一边对数据区域的扩展处理的作用进行说明。该数据区域的扩展处理通过R/W通道34接收CPU32的指示并从R/W通道34向前置放大器17发送而执行。Next, the operation of the data area expansion process will be described with reference to FIGS. 11 and 12 . The expansion processing of this data area is performed by the R/W channel 34 receiving an instruction from theCPU 32 and sending it from the R/W channel 34 to thepreamplifier 17 .

在数据写入的开始后(ST101：是)，判定读取头15是否位于读取伺服数据D2的伺服位置(ST102)。在判定为位于伺服位置的情况下(ST102：是)，使伺服选通成为有效，伺服选通信号SG成为ON(ST103)。此时，滑块13a位于图11的位置P1，读取头15位于位置TA1，并且，写入头14的位置位于位置TA2。由于省电信号PWR_SAVE成为无效，所以，读取信号被输出，当伺服选通信号SG成为ON时，能够进行伺服数据D2的读取。此时，写入选通信号WG保持着有效，所以，继续进行数据的写入。After the start of data writing ( ST101 : YES), it is determined whether or not the readhead 15 is at the servo position for reading the servo data D2 ( ST102 ). When it is determined that it is at the servo position (ST102: YES), the servo gate is enabled, and the servo gate signal SG is turned ON (ST103). At this time, theslider 13a is located at the position P1 in FIG. 11, the readinghead 15 is located at the position TA1, and the position of the writinghead 14 is located at the position TA2. Since the power saving signal PWR_SAVE becomes inactive, the read signal is output, and when the servo strobe signal SG is turned on, the servo data D2 can be read. At this time, the write strobe signal WG remains active, and therefore, data writing is continued.

当如已经描述那样地伺服选通成为有效后(ST103)，伺服数据D2被读取(ST104)。接着，判定数据的写入是否结束(ST105)，若判定为数据的写入未结束(ST105：否)，则继续进行伺服数据D2的读取(ST104)，若判定为数据的写入结束(ST105：是)，则使写入选通成为无效(ST106)。此时，滑块13a位于图11的P2，读取头15位于位置TB1，并且，写入头14位于位置TB2。此时，伺服选通保持着有效，所以，伺服数据D2的读取继续，但是，写入选通成为无效，所以，数据的写入结束。When the servo strobe is enabled as already described (ST103), the servo data D2 is read (ST104). Next, it is determined whether the writing of the data is completed (ST105), and if it is determined that the writing of the data is not completed (ST105: NO), the reading of the servo data D2 is continued (ST104), and if it is determined that the writing of the data is completed ( ST105: YES), the write strobe is disabled (ST106). At this time, theslider 13a is located at P2 in FIG. 11, theread head 15 is located at the position TB1, and thewrite head 14 is located at the position TB2. At this time, since the servo strobe remains active, the reading of the servo data D2 continues, but the write strobe becomes inactive, so that the writing of the data ends.

像这样，从位置TA1到位置TB1，写入选通成为有效，且伺服选通也成为有效。因而，在数据的写入中，能够读取伺服数据D2。因此，在不使用本实施方式的构成的情况下，为了读取伺服数据D2，在使伺服选通成为有效的位置之前的位置(位置TA1与位置TB2之间)结束写入，但是，在本实施方式中，能够使从该位置到结束写入的位置(位置TB1)成为数据扩展区域W2。In this way, from the position TA1 to the position TB1, the write strobe is enabled, and the servo strobe is also enabled. Therefore, during data writing, the servo data D2 can be read. Therefore, when the configuration of the present embodiment is not used, in order to read the servo data D2, writing is completed at the position (between the position TA1 and the position TB2) before the position where the servo strobe is enabled (between the position TA1 and the position TB2). In the embodiment, it is possible to make the data extension area W2 from this position to the position where writing is completed (position TB1).

图13是将进行参照图11、图12说明了的处理的情况(情形S2)和不进行该处理的情况(情形S1)作为比较的一例而示出的图。在图13的上侧示出情形S1，在下侧示出情形S2。FIG. 13 is a diagram showing, as an example of comparison, a case where the processing described with reference to FIGS. 11 and 12 is performed (case S2 ) and a case where the processing is not performed (case S1 ). Case S1 is shown on the upper side of FIG. 13 , and case S2 is shown on the lower side.

首先，说明情形S1的情况。在读取头15的位置为位置T2时，使写入选通成为无效，结束写入。此时，写入头14的位置处于位置T1。像这样，以不并行地进行数据的写入和数据的读取的方式进行控制，所以，产生无法作为数据区域而使用的区域。First, the case of the case S1 will be described. When the position of the readhead 15 is the position T2, the write strobe is deactivated, and the writing is terminated. At this time, the position of thewrite head 14 is at the position T1. In this way, the data writing and data reading are controlled so as not to be performed in parallel, so that an area that cannot be used as a data area is generated.

接着，说明情形S2的情况。在省电信号PWR_SAVE在位置T1成为OFF而能够进行数据的读取之后，在读取头15的位置为位置T2附近时，不使写入选通成为无效，使数据的写入继续。并且，从读取头15的位置为位置T3时起，使伺服选通成为有效，开始伺服数据D2的读取。此时，数据的写入也不结束，在写入头14位于位置T4时，使写入选通成为无效，使数据的写入结束。也就是说，在从位置T3到位置T4之间，在数据的写入中并行地执行伺服数据的读取。通过这样做，能够设置从位置T2到位置T4的数据扩展区域W2，能够减少像情形S1那样无法作为数据区域而活用的区域。Next, the case of the case S2 will be described. After the power saving signal PWR_SAVE is turned OFF at the position T1 and data can be read, when the position of the readhead 15 is in the vicinity of the position T2, the write strobe is not deactivated, and data writing is continued. Then, from the time when the position of thepickup head 15 is the position T3, the servo strobe is enabled, and the reading of the servo data D2 is started. At this time, the writing of data is also not completed, and when thewrite head 14 is located at the position T4, the write strobe is deactivated, and the writing of data is completed. That is, from the position T3 to the position T4, the reading of the servo data is performed in parallel in the writing of the data. By doing so, the data extension area W2 from the position T2 to the position T4 can be provided, and the area that cannot be utilized as the data area like in the case S1 can be reduced.

如以上说明那样，根据本实施方式的磁盘装置1，通过在数据的写入中读取伺服数据D2，在设计数据格式时，能够确保并行地进行数据的写入和数据的读取的数据扩展区域W2，能够扩展能够进行对于磁盘11的数据处理的区域。As described above, according to the magnetic disk device 1 of the present embodiment, by reading the servo data D2 during data writing, it is possible to ensure data expansion in which data writing and data reading are performed in parallel when designing a data format. The area W2 can expand the area in which data processing with respect to themagnetic disk 11 can be performed.

(第3实施方式)(third embodiment)

第3实施方式，在追加了没能读取伺服数据的情况下的处理这一点，与第1及第2实施方式不同。此外，对与第2实施方式相同的构成标注同一标号，关于这些构成，省略详细的说明。The third embodiment differs from the first and second embodiments in that processing when the servo data cannot be read is added. In addition, the same code|symbol is attached|subjected to the same structure as 2nd Embodiment, and a detailed description about these structure is abbreviate|omitted.

图14是示出数据区域的扩展处理的一例的流程图。此外，步骤ST101～ST106的处理与第1实施方式是同样的，所以，对追加的步骤ST201～ST204的处理进行说明。此外，R/W通道34接收CPU32的指示并从R/W通道34向前置放大器17发送而执行处理，这与第1实施方式是同样的。FIG. 14 is a flowchart showing an example of data area expansion processing. In addition, since the processing of steps ST101 to ST106 is the same as that of the first embodiment, the processing of the additional steps ST201 to ST204 will be described. In addition, the R/W channel 34 receives an instruction from theCPU 32 and transmits it from the R/W channel 34 to thepreamplifier 17 to execute processing, which is the same as the first embodiment.

在步骤ST104的处理结束了的情况下，判定是否不能进行伺服数据D2的读取(ST201)。在不能进行伺服数据D2的读取的情况下(ST201：否)，也就是说读取到了伺服数据D2的情况下，向步骤ST105的处理前进，执行已经描述的处理。When the process of step ST104 ends, it is determined whether or not the reading of the servo data D2 is impossible (ST201). When the servo data D2 cannot be read (ST201: NO), that is, when the servo data D2 has been read, the process proceeds to step ST105, and the above-described process is executed.

另外，在不能进行伺服数据D2的读取的情况下(ST201：是)，判定是否进行写入重试(ST202)。在判定为不进行写入重试的情况下(ST202：否)，向步骤ST105的处理前进，执行已经描述的处理。In addition, when the servo data D2 cannot be read (ST201: YES), it is determined whether or not to perform write retry (ST202). When it is determined that the write retry is not to be performed (ST202: NO), the process proceeds to step ST105, and the processes already described are executed.

另一方面，在判定为进行写入重试的情况下(ST202：是)，设定以前1个伺服数据为基准进行写入的重试模式(ST203)，重试数据的写入(ST204)。然后，执行步骤ST106的处理。由此，在无法读取伺服数据D2的情况下，磁盘装置1也能够执行写入处理。当在写入数据时进行数据的读取时，写入头14的数据的写入与读取头15的数据的读取同时被执行，所以，存在在伺服信号中加入有噪声的情况，也有可能存在数据的写入失败的情况，但是，通过进行数据的写入的重试，磁盘装置1能够切实地执行数据的写入。On the other hand, when it is determined that writing retry is to be performed (ST202: YES), a retry mode in which writing is performed based on the previous servo data is set (ST203), and data writing is retried (ST204). . Then, the process of step ST106 is executed. Thereby, even when the servo data D2 cannot be read, the magnetic disk device 1 can execute the write process. When data reading is performed at the time of writing data, the writing of data by the writinghead 14 and the reading of data by the readinghead 15 are simultaneously performed. Therefore, noise may be added to the servo signal. There may be cases where the writing of data fails, but by retrying the writing of the data, the magnetic disk device 1 can reliably execute the writing of the data.

(第4实施方式)(fourth embodiment)

第4实施方式，在解调电路34a、放大电路17a设置有带通滤波器电路这一点，与第1及第2实施方式不同。此外，对与第2实施方式相同的构成标注同一标号，关于这些构成，省略详细的说明。The fourth embodiment differs from the first and second embodiments in that thedemodulation circuit 34a and theamplifier circuit 17a are provided with band-pass filter circuits. In addition, the same code|symbol is attached|subjected to the same structure as 2nd Embodiment, and a detailed description about these structure is abbreviate|omitted.

图15是概略地示出R/W通道34及前置放大器17的构成的一例的图。在R/W通道34的解调电路34a内设置有带通滤波器设定电路51，在前置放大器17的放大电路17a内设置有带通滤波器设定电路52。此外，在本实施方式中，以R/W通道34及前置放大器17都包括带通滤波器设定电路51、52的情况进行了说明，但是，也可以设置于R/W通道34和前置放大器17中的任一者。FIG. 15 is a diagram schematically showing an example of the configuration of the R/W channel 34 and thepreamplifier 17 . A band-passfilter setting circuit 51 is provided in thedemodulation circuit 34 a of the R/W channel 34 , and a band-passfilter setting circuit 52 is provided in the amplifyingcircuit 17 a of thepreamplifier 17 . In addition, in this embodiment, the case where both the R/W channel 34 and thepreamplifier 17 include the bandpassfilter setting circuits 51 and 52 has been described, but it may be provided in the R/W channel 34 and thepreamplifier 17. Any of theamplifiers 17 are installed.

带通滤波器设定电路51、52分别使预定的范围的频率通过。预定的范围的设定例如可以由CPU32进行。通过预定的范围的频率的设定，带通滤波器设定电路51、52既成为高通滤波器，又成为低通滤波器。另外，在本实施方式中，带通滤波器设定电路51、52构成为，经由R/W通道34接收来自CPU32的伺服选通的有效/无效的指示及写入选通的无效的指示，在写入头14的数据的写入和读取头15的数据的读取同时执行的期间(换言之，在已经描述的数据扩展区域W2之间)，成为激活。The band-passfilter setting circuits 51 and 52 respectively pass frequencies in a predetermined range. The setting of the predetermined range can be performed, for example, by theCPU 32 . By setting a frequency in a predetermined range, the band-passfilter setting circuits 51 and 52 become both high-pass filters and low-pass filters. In addition, in the present embodiment, the bandpassfilter setting circuits 51 and 52 are configured to receive, via the R/W channel 34, the instruction to enable/disable the servo strobe and the instruction to disable the write strobe from theCPU 32, The period in which the writing of the data by thewrite head 14 and the reading of the data by the readhead 15 are performed simultaneously (in other words, between the data extension areas W2 already described) becomes active.

若像这样构成，则能够对以解调电路34a、放大电路17a读取到的信号进行滤波，所以，能够除去由于写入头14的数据的写入和读取头15的数据的读取同时执行而有可能产生的无用的噪声，使得成为精度高的读取信号。With this configuration, the signal read by thedemodulation circuit 34a and theamplifier circuit 17a can be filtered, so that the simultaneous writing of data by thewrite head 14 and the reading of data by the readhead 15 can be eliminated. Useless noise that may be generated due to execution results in a high-precision read signal.

(第5实施方式)(Fifth Embodiment)

第5实施方式，在R/W通道34及前置放大器17、或者R/W通道34和前置放大器17中的任一方设置有消除电路这一点，与第1及第2实施方式不同。此外，对与第2实施方式相同的构成标注同一标号，关于这些构成，省略详细的说明。The fifth embodiment differs from the first and second embodiments in that a cancellation circuit is provided in either the R/W channel 34 and thepreamplifier 17 or the R/W channel 34 and thepreamplifier 17 . In addition, the same code|symbol is attached|subjected to the same structure as 2nd Embodiment, and a detailed description about these structure is abbreviate|omitted.

图16是概略地示出R/W通道34及前置放大器17的构成的一例的图。在R/W通道34设置有消除(记录信号反相)电路34c，并且，在前置放大器17设置有消除(记录信号反相)电路17c。另外，记录信号生成电路34b能够向消除(记录信号反相)电路34c输出信号，消除(记录信号反相)电路34c能够向解调电路34a输出信号。另外，记录电流生成电路17b能够向消除(记录信号反相)电路17c输出信号，消除(记录信号反相)电路17c能够向放大电路17a输出信号。FIG. 16 is a diagram schematically showing an example of the configuration of the R/W channel 34 and thepreamplifier 17 . The R/W channel 34 is provided with a cancellation (recording signal inversion)circuit 34c, and thepreamplifier 17 is provided with a cancellation (recording signal inversion)circuit 17c. In addition, the recordingsignal generation circuit 34b can output a signal to the erasing (recording signal inversion)circuit 34c, and the erasing (recording signal inversion)circuit 34c can output a signal to thedemodulation circuit 34a. In addition, the recordingcurrent generation circuit 17b can output a signal to the erasing (recording signal inversion)circuit 17c, and the erasing (recording signal inversion)circuit 17c can output a signal to theamplifier circuit 17a.

消除(记录信号反相)电路34c及消除(记录信号反相)电路17c进行下述处理：基于从SOC31输入的写入数据的反相波形的输出及频率而消除作为噪声源的写入数据的波形。由此，能够除去由于写入头14的数据的写入和读取头15的数据的读取同时执行而有可能产生的无用的噪声，使得成为精度高的读取信号。The erasing (recording signal inversion)circuit 34c and the erasing (recording signal inversion)circuit 17c perform a process of erasing the write data which is a noise source based on the output and frequency of the inverted waveform of the write data input from theSOC 31. waveform. Thereby, unnecessary noise that may be generated due to simultaneous execution of data writing by thewrite head 14 and data reading by the readhead 15 can be removed, and a high-precision read signal can be obtained.

另外，在图16中，以在R/W通道34设置消除(记录信号反相)电路34c及在前置放大器17设置消除(记录信号反相)电路17c的情况进行了说明，但是，消除电路的配置不限于此。例如，也可以如图17所示，不在前置放大器17设置消除电路，而在R/W通道34设置消除(记录信号反相)电路34d，从消除(记录信号反相)电路34d对解调电路34a进行消除写入数据的波形的处理。另外，也可以如图18所示，不在R/W通道34设置消除电路，而在前置放大器17设置消除(记录信号反相)电路34e，从消除(记录信号反相)电路34e对放大电路17a进行消除写入数据的波形的处理。In addition, in FIG. 16, the case where the cancellation (recording signal inversion)circuit 34c is provided in the R/W channel 34 and the cancellation (recording signal inversion)circuit 17c in thepreamplifier 17 has been described. However, the cancellation circuit The configuration is not limited to this. For example, as shown in FIG. 17 , instead of providing the cancel circuit in thepreamplifier 17, the cancel (record signal inversion)circuit 34d may be provided in the R/W channel 34, and the demodulation may be performed from the cancel (record signal inversion)circuit 34d. Thecircuit 34a performs processing of erasing the waveform of the written data. In addition, as shown in FIG. 18, instead of providing the cancellation circuit in the R/W channel 34, thepreamplifier 17 may be provided with the cancellation (recording signal inversion)circuit 34e, and the amplifying circuit may be changed from the cancellation (recording signal inversion)circuit 34e to thepreamplifier 17. 17a performs processing of erasing the waveform of the written data.

此外，在上述各实施方式中，对在数据的写入中读取伺服数据D2的情况进行了说明，但是，不限于此。在数据的写入中例如读取像用户数据那样的数据的情况下，也能够应用上述实施方式的数据区域的扩展处理。In addition, in each of the above-described embodiments, the case where the servo data D2 is read during data writing has been described, but the present invention is not limited to this. For example, when data such as user data is read during data writing, the data area expansion process of the above-described embodiment can also be applied.

另外，在磁盘装置中，存在具有如下构成的情况：为了防止写入头14的数据的写入和读取头15的数据的读取同时执行，在写入数据的生成中，在使伺服选通成为有效的情况下，使得成为选通失败。在具有这样的构成的情况下，在磁盘装置在数据的写入中进行读取的情况下通过停止使得成为选通失败的控制，能够同时执行写入头14的数据的写入和读取头15的数据的读取。例如，CPU32在写入中进行数据的读取的情况下，通过执行从使伺服选通成为有效起一定时间而停止使得成为选通失败的控制的处理，磁盘装置能够在数据的写入中进行数据的读取。In addition, in a magnetic disk apparatus, there is a case where a configuration is made such that, in order to prevent the writing of data by thewrite head 14 and the reading of data by the readhead 15 from being performed at the same time, when generating the write data, the servo selection is performed. In the case that the pass becomes valid, it becomes a gating failure. With such a configuration, when the magnetic disk device reads data while writing data, it is possible to simultaneously execute the data writing of the writinghead 14 and the reading head by stopping the control that causes the strobe failure. 15 data read. For example, when theCPU 32 reads data during writing, the magnetic disk device can perform data writing by executing the process of stopping the control to fail the gating for a certain period of time after the servo strobe is enabled. data read.

此外，对本发明的几个实施方式进行了说明，但这些实施方式是作为例子而提示的，并非意在限定发明的范围。这些新的实施方式能够以其他各种各样的方式来实施，能够在不脱离发明的宗旨的范围内进行各种省略、置换、变更。这些实施方式及其变形包含于发明的范围、宗旨，并且，包含于技术方案记载的发明及其等同的范围。In addition, although some embodiment of this invention was described, these embodiment is shown as an example, Comprising: It is not intended that the scope of the invention is limited. These new embodiments can be implemented in various other forms, and various omissions, substitutions, and changes can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the scope of equivalents thereof.

Claims (8)

1. A magnetic disk device is provided with:

a disk unit including a magnetic disk, a magnetic head including a write head and a read head, and a preamplifier including a1 st circuit and a2 nd circuit, the read head being disposed apart from the write head by a predetermined distance in a rotation direction of the magnetic disk, the 1 st circuit generating a recording current for writing data to the magnetic disk by the write head, the 2 nd circuit amplifying a signal reproduced from the magnetic disk by the read head; and

a control section including a processing section, the control section controlling the disk section,

the processing section causes the preamplifier to execute: a process of generating a recording current to be written by the write head to the magnetic disk, and a process of receiving an output reproduced by the read head from the magnetic disk,

in the preamplifier, a process of reading data from the magnetic disk by the read head is executed in parallel with a process of writing data transferred from the control section to the magnetic disk by the write head.

2. The magnetic disk apparatus according to claim 1,

the control unit retries the data writing with reference to the servo data read last time when the servo data cannot be read.

3. The magnetic disk apparatus according to claim 1,

in the 1 st circuit active period, the 2 nd circuit is activated based on an instruction from the control unit.

4. The magnetic disk device according to claim 3,

the timing of enabling/disabling the 1 st circuit is adjusted based on an instruction from the control unit.

5. The magnetic disk device according to claim 3,

the 2 nd circuit includes a band pass filter circuit that passes a predetermined range of frequencies.

6. The magnetic disk device according to any of claims 1 to 5,

the preamplifier includes an erase circuit that performs: the waveform of the read data is canceled based on the output and frequency of the inverted waveform of the data to be written, which is input from the control unit.

7. The magnetic disk device according to any of claims 1 to 5,

the processing unit includes a read/write channel having a 3 rd circuit for transmitting a recording signal to the 1 st circuit and a 4 th circuit for demodulating a reproduced waveform transmitted from the 2 nd circuit,

in the active period of the 3 rd circuit, the 4 th circuit is activated based on an instruction from the control unit.

8. A magnetic disk device is provided with:

a disk unit including a magnetic disk, a magnetic head including a write head and a read head, and a preamplifier including a1 st circuit and a2 nd circuit, the read head being disposed apart from the write head by a predetermined distance in a rotation direction of the magnetic disk, the 1 st circuit generating a recording current for writing data to the magnetic disk by the write head, the 2 nd circuit amplifying an output reproduced from the magnetic disk by the read head; and

a control section including a processing section, the control section controlling the disk section; and

a power saving signal line connected to the preamplifier and the control unit, and setting activation/power saving of an output reproduced by the pickup,

the processing section causes the preamplifier to execute: a process of generating a recording current to be written by the write head to the magnetic disk, and a process of receiving an output reproduced by the read head from the magnetic disk,

in parallel with the process of generating the current for recording to the magnetic disk, the signal reproduced by the read head is activated based on the instruction via the power saving signal line.

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