US20080094985A1 - Optical disk having tracking polarity information, and apparatuses and methods for recording and reproducing user data on the same - Google Patents
Optical disk having tracking polarity information, and apparatuses and methods for recording and reproducing user data on the sameDownload PDFInfo
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- US20080094985A1 US20080094985A1US11/959,865US95986507AUS2008094985A1US 20080094985 A1US20080094985 A1US 20080094985A1US 95986507 AUS95986507 AUS 95986507AUS 2008094985 A1US2008094985 A1US 2008094985A1
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
- G11B7/00736—Auxiliary data, e.g. lead-in, lead-out, Power Calibration Area [PCA], Burst Cutting Area [BCA], control information
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/0945—Methods for initialising servos, start-up sequences
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
- G11B2007/0006—Recording, reproducing or erasing systems characterised by the structure or type of the carrier adapted for scanning different types of carrier, e.g. CD & DVD
Definitions
- the present inventionrelates to an optical disc, and more particularly, to an optical disc having at least one recording layer, and apparatuses and methods for recording and reproducing data on the same.
- CDsCompact discs
- DVDsdigital versatile discs
- PCMphase change material
- a pickupwhich is included in an optical disc reproducing apparatus, detects a precise position of a track in which the user data is recorded, receives a laser beam reflected from the track, and reads the user data from the laser beam.
- a signal that the pickup uses to detect a position of a desired trackis called a tracking signal.
- the tracking signalis obtained when a photo diode, which has a plurality of light receiving parts, receives the laser beam. Signals are generated from lights received by the respective light receiving parts, and then, the signals are added together or subtracted from each other.
- the tracking signalcurves like an S-shape and right and left sides of the tracking signal, which are divided with respect to a central point of the tracking signal, have opposite polarities.
- the polarities of the tracking signalchange according to a type of the optical disc or physical characteristics of the recording layer on the optical disc, such as the physical characteristics of the pit or the track.
- the polarities of the tracking signalchange from ( ⁇ ) to (+) and from (+) to ( ⁇ ) according to the type of optical disc or the physical characteristics of the recording layer. Therefore, when the optical disc is loaded into a conventional optical disc reproducing apparatus, the apparatus determines the polarity of a tracking signal by trial and error, detects the position of the track in which the user data is recorded based on the polarity, and reads the user data from the track. That is, the conventional optical disc reproducing apparatus spends considerable time in detecting the polarity of the tracking signal before reading the user data, thereby delaying a reproduction of the user data.
- a reflectivity of the optical discis a ratio of a power of the laser beam reflected from the recording layer of the optical disc to the power of the laser beam incident on the recording layer.
- the reflectivityalso depends on the type of optical disc or the physical characteristics of the recording layer, and therefore, the conventional optical disc reproducing apparatus detects the reflectivity by trial and error.
- the present inventionprovides an optical disc from which information regarding a polarity of a tracking signal and/or a reflectivity is easily recognized, and apparatuses and methods for recording and reproducing information on the same.
- an optical discincluding a clamping area; a lead-in area; a data area; and a burst cutting area (BCA) which is present between the clamping area and the lead-in area and in which information regarding the optical disc is recorded, wherein the information is read before performing tracking in the data area.
- BCAburst cutting area
- the information regarding the optical discis at least one of tracking polarity information and reflectivity information, and the tracking polarity information and the reflectivity information are recorded with a pattern of crystalline or non-crystalline marks.
- the recording of the tracking polarity informationbegins at leading bytes in the BCA and is repeatedly recorded.
- first two bits of the leading bytes of the tracking polarity informationinclude identifiers of the respective tracking polarity information that is repeatedly recorded several times, and other six bits include remaining information of the tracking polarity information.
- one of the six bitsincludes flag information that indicates whether other information is recorded in the BCA, and the other five bits of the six bits include the tracking polarity information that indicates a polarity of a tracking signal related to each recording layer of the optical disc.
- an optical discincluding a first recording layer in which a first lead-in area, a first data area, and a first lead-out area are formed; and a second recording layer in which a second lead-in area, a second data area, and a second lead-out area are formed, wherein at least one of the first and second recording layers includes a burst cutting area (BCA), in which information regarding the optical disc is recorded, and the information is read before performing tracking in the first and second data areas.
- BCAburst cutting area
- the information regarding the optical discis at least one of tracking polarity information and reflectivity information, and the tracking polarity information and the reflectivity information are recorded with a pattern of crystalline or non-crystalline marks.
- the recording of the tracking polarity informationbegins in leading bytes in the BCA and is repeatedly recorded.
- a method of recording information on an optical discthat has at least one recording layer, the method including recording at least one of tracking polarity information and reflectivity information in a burst cutting area (BCA) of the recording layer.
- BCAburst cutting area
- a method of reproducing information on an optical disc which has at least one recording layerincluding reading tracking polarity information in a burst cutting area (BCA) of the recording layer, and analyzing the read tracking polarity information, outputting an analysis result indicative thereof, performing tracking in the recording layer of the optical disc using the analysis result, and recording or reproducing user data on the optical disc.
- BCAburst cutting area
- a method of reproducing information on an optical disc which has at least one recording layerincluding reading reflectivity information in a burst cutting area (BCA) of the recording layer; and analyzing the reflectivity information and outputting an analysis result indicative thereof, adjusting the write or read power of a laser beam using the analysis result, and recording or reproducing user data on the optical disc.
- BCAburst cutting area
- an optical disc recording apparatusincluding a controller creating at least one of tracking polarity information and reflectivity information; and a recording unit recording the at least one of tracking information and reflectivity information created by the controller in a a burst cutting area (BCA) of an optical disc.
- BCAburst cutting area
- an optical disc reproducing apparatusincluding a reading unit reading at least one of tracking polarity information and reflectivity information from a burst cutting area (BCA) of an optical disc, and a controller analyzing the information read by the reading unit and outputting an analysis result indicative thereof, and recording or reproducing user data on the optical disc using the analysis result.
- BCAburst cutting area
- an optical disccomprising: a first recording layer formed on the optical disc; a second recording layer formed on the optical disc, wherein the first recording layer and a second recording layer each comprise a clamping area, a burst cutting area (BCA), a lead-in area, and a lead-out area, wherein the clamping area is an area that is pressurized to clamp the optical disc, and the BCA is an area in which tracking polarity information and/or reflectivity information is recorded; and a data area recording user data between the lead-in area and the lead-out area.
- BCAburst cutting area
- FIG. 1is a schematic block diagram of an optical disc recording apparatus, according to an aspect of the present invention.
- FIG. 2is a schematic block diagram of an optical disc reproducing apparatus, according to an aspect of the present invention.
- FIG. 3is a schematic block diagram of an optical disc, according to an aspect of the present invention.
- FIGS. 4A and 4Bare schematic block diagrams of the optical disc, according to another aspect of the present invention.
- FIGS. 5A and 5Bare schematic block diagrams of the optical disc according to still another aspect of the present invention.
- FIG. 6Aillustrates a data structure of a burst cutting area (BCA) of the optical disc, according to an aspect of the present invention
- FIG. 6Billustrates the data structure of the BCA of the optical disc, according to another aspect of the present invention.
- FIG. 7illustrates the data structure of information recorded on the BCA of the optical disc, according to an aspect of the present invention
- FIG. 8is a flowchart illustrating a method of reproducing data from the optical disc, according to an aspect of the present invention.
- FIG. 9is a flowchart illustrating the method of reproducing data from the optical disc, according to another aspect of the present invention.
- FIG. 1is a schematic block diagram of an optical disc recording apparatus, according to an aspect of the present invention.
- the recording apparatusincludes a recording unit 1 and a controller 2 to record information regarding a polarity of a tracking signal and/or a reflectivity of an optical disc 100 on a burst cutting area (BCA) on the optical disc 100 .
- the controller 2creates the information regarding the polarity of the tracking signal and/or the reflectivity of the BCA and the recording unit 1 records at least one of tracking polarity information and reflectivity information on the BCA.
- the BCA of the optical disc 100includes the tracking polarity information and/or the reflectivity information.
- FIG. 2is a schematic block diagram of an optical disc reproducing apparatus, according to an aspect of the present invention.
- the reproducing apparatusincludes a reading unit 4 and a controller 5 .
- the reading unit 4reads the tracking polarity information and/or the reflectivity information from the BCA on the optical disc 100 , according to an aspect of the present invention, and provides an analysis result indicative thereof to the controller 5 .
- the controller 5analyzes the tracking polarity information and/or the reflectivity information and reproduces user data from the optical disc 100 based on the analysis result.
- the recording apparatus of FIG. 1is an apparatus used in a mastering process by a disc manufacturer.
- the reproducing apparatus of FIG. 2is an apparatus to reproduce the tracking polarity information and/or the reflectivity information, not the user data, from the BCA.
- the reproducing apparatus of FIG. 2can be included in both the optical disc recording apparatus and the optical disc reproducing apparatus because the reproduction of the above information can be carried out when recording or reproducing the user data on the optical disc 100 .
- FIG. 3is a schematic block diagram of the optical disc 100 , according to an aspect of the present invention.
- a first recording layer l 0is formed on the optical disc 100 .
- the first recording layer l 0includes a clamping area C, the BCA B, a lead-in area LI, and a lead-out area LO.
- the clamping area Cis an area that is pressurized by a clamping tool in order to clamp the optical disc 100 .
- the clamping area Cis circular band shaped and formed in an inner portion of the optical disc 100 .
- the BCA Bis an area in which the tracking polarity information and/or the reflectivity information is recorded.
- the particulars of the optical disc 100may be further recorded in the BCA B.
- a data area in which the user data is recordedis present between the lead-in area LI and the lead-out area LO.
- the first recording layer l 0is formed of a phase change material (PCM)
- the tracking polarity information and/or the reflectivity informationmay be recorded with a pattern of crystalline and/or non-crystalline marks.
- a method of recording information in the BCA Bis disclosed in Korean Patent Application No. 2001-47957 entitled “Optical Disc and Methods for Recording and Reproducing Essential Information of Optical Disc,” also filed by the present applicant.
- FIGS. 4A and 4Bare schematic block diagrams of the optical disc 100 , according to another aspect of the present invention.
- the first recording layer l 0 and a second recording layer l 1are formed on the optical disc 100 .
- Each of the first recording layer l 0 and the second recording layer l 1includes the clamping area C, the lead-in area LI, and the lead-out area LO.
- the data area in which the user data is recordedis present between the lead-in area LI and the lead-out area LO.
- the clamping area C, the lead-in area LI, and the lead-out area LOare the same as those explained with respect to FIG. 3 , and therefore, their descriptions will not be repeated here.
- the BCA Bis present between the clamping area C and the lead-in area LI of the first recording layer l 1 .
- the tracking polarity information and/or the reflectivity informationis recorded in the BCA B, according to an aspect of the present invention.
- the particulars of the optical disc 100such as the corresponding serial number and the manufacturing date, may be further recorded in the BCA B.
- the first recording layer l 0is formed of the phase change material (PCM)
- the tracking polarity information and/or the reflectivity informationmay be recorded with the pattern of the crystalline and/or the non-crystalline marks.
- FIGS. 5A and 5Bare schematic block diagrams of the optical disc 100 , according to still another aspect of the present invention.
- the first recording layer l 0 and the second recording layer l 1are formed on the optical disc 100 .
- Each of the first recording layer l 0 and the second recording layer l 1includes a clamping area C, a lead-in area LI, and a lead-out area LO.
- the data area in which the user data is recordedis present between the lead-in area LI and the lead-out area LO.
- the clamping area C, the lead-in area LI, and the lead-out area LOare the same as those explained with respect to FIG. 3 , and therefore, their descriptions will not be repeated here.
- the BCA Bis formed on the second recording layer l 1 , unlike in FIGS. 4A and 4B in which the BCA B is present on the first recording layer l 0 . That is, the BCA B of FIGS. 5A and 5B is present between the clamping area C and the lead-in area LI of the second recording layer l 1 . If the second recording layer l 1 is formed of the phase change material (PCM), the tracking polarity information or reflectivity information may be recorded with a pattern of crystalline and/or non-crystalline marks.
- PCMphase change material
- optical disc 100 of FIGS. 5A and 5Bis different from that of FIGS. 4A and 4B in that the BCA B is present in the second recording layer, not the first recording layer.
- FIG. 6Aillustrates a data structure of the BCA of the optical disc 100 , according to an aspect of the present invention.
- the tracking polarity informationis recorded in the BCA, according to an aspect of the present invention.
- the tracking polarity informationprovides the polarity of the tracking signal related to the optical disc 100 .
- the tracking signalcurves like an S-shape and corresponding right and left sides, which are divided with respect to the central point of the tracking signal, have opposite polarities.
- the polarity of the tracking signalchanges according to a type of the optical disc 100 , or physical characteristics of the recording layer such as the physical characteristics of a pit or a track.
- the polarities of the tracking signalchange from ( ⁇ ) to (+) and (+) to ( ⁇ ) according to the type of the optical disc 100 or the physical characteristics of the recording layer.
- the particulars of the optical disc 100may be further recorded in the BCA, as well as the tracking polarity information.
- FIG. 6Billustrates a data structure of the BCA of the optical disc 100 , according to another aspect of the present invention.
- the tracking polarity information and/or the reflectivity informationis recorded in the BCA, according to an aspect the present invention.
- the tracking polarity informationis as described with reference to FIG. 6A .
- the reflectivity informationprovides the reflectivity of the optical disc 100 , which is a ratio of the power of a laser beam reflected from the recording layer of the optical disc 100 to the power of the laser beam incident on the recording layer.
- the reflectivityalso changes according to the type of the optical disc 100 or the physical characteristics of the recording layer.
- the tracking polarity informationis recorded in both the BCAs of FIGS. 6A and 6B , but only the reflectivity information can be recorded if needed.
- FIG. 7illustrates a data structure of the information recorded in the BCA of the optical disc 100 , according to an aspect of the present invention.
- FIG. 7shows an example of the BCA in the optical disc 100 having two recording layers as shown in FIGS. 4 and 5 .
- the tracking polarity informationis repeatedly recorded four times in the BCA and the recording begins at leading bytes of the BCA.
- First two bits b 1 b 0 of the tracking polarity informationare identifiers of the respective information that is repeatedly recorded. If the first two bits b 1 b 0 are 00, the information indicates that first tracking polarity information is recorded in the BCA. If the first two bits b 1 b 0 are 01, the information indicates that second tracking polarity information is recorded in the BCA.
- the other six bits b 7 b 6 b 5 b 4 b 3 b 2provide the information.
- the bit b 2includes flag information indicating whether or not other information, i.e., the particulars of the optical disc 100 , is recorded in the BCM. If the bit b 2 is 0, the information indicates that the other information is not recorded in the BCM. If the bit b 2 is 1, the information indicates that the other information is recorded in the BCM.
- the bits b 7 b 6 b 5 b 4 b 3represent the tracking polarity information and can be defined as follows:
- the six bits b 7 b 6 b 5 b 4 b 3 b 2is expressed as ‘000010’.
- the other informationsuch as the particulars of the optical disc 100
- both polarities of the tracking signals related to the first and second recording layersare type A
- the six bits b 7 b 6 b 5 b 4 b 3 b 2is expressed as ‘000101’.
- 1 byteis not enough to express the tracking polarity information, for example, if the number of recording layers is more than 2, it is possible to express the tracking polarity information using additional bits in addition to the 1 byte.
- the disc driveWhen the optical disc 100 is loaded into a disc drive of the optical disc reproducing apparatus, the disc drive easily accesses leading bytes of the BCA so as to read the tracking polarity information and/or the reflectivity information. Accordingly, the recording of the tracking polarity information and/or reflectivity information may begin on the leading bytes of the BCA.
- the data that is reproduced using the methodis not the user data, but the tracking polarity information and/or the reflectivity information recorded in a BCA of the optical disc 100 .
- the reproduction of such datacan be performed both when recording and reproducing the user data in a data area.
- FIG. 8is a flowchart illustrating the method of reproducing the data from the optical disc 100 , according to an aspect of the present invention.
- the optical pickup included in the disc drivereads the tracking polarity information from the BCA of the optical disc 100 .
- the reproducing apparatus(or the disc drive) performs the tracking on the optical disc 100 using the read tracking polarity information without trial and error, and records or reproduces the user data in a data area of the optical disc 100 .
- the optical pickupprovides the tracking polarity information to the disc drive, and then, the disc drive controls the optical pickup using the information to perform the recording or the reproducing of the user data on the optical disc 100 .
- FIG. 9is a flowchart illustrating the method of reproducing the data from the optical disc 100 , according to another aspect of the present invention.
- the optical pickup included in the disc drivereads reflectivity information from the BCA of the optical disc 100 .
- the reproducing apparatus(or the disc drive) adjusts the write/read power of the laser beam using the read reflectivity information without trial and error, and records or reproduces the user data in the data area of the optical disc 100 .
- the optical pickupprovides the reflectivity information to the disc drive, and then, the disc drive controls the optical pickup using the information to perform the recording or the reproducing of the user data on the optical disc 100 .
- tracking polarity information and/or reflectivity informationis recorded in a BCA of an optical disc according to an aspect of the present invention. Accordingly, it is possible to obtain the tracking polarity information and/or reflectivity information without trial and error and directly record or reproduce user data in a data area of the optical disc.
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Abstract
Description
- This application is a continuation of U.S. patent application Ser. No. 10/695,393, filed Oct. 29, 2003, which claims the priority of Korean Patent Application No. 2002-67968 filed Nov. 4, 2002, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety by reference.
- 1. Field of the Invention
- The present invention relates to an optical disc, and more particularly, to an optical disc having at least one recording layer, and apparatuses and methods for recording and reproducing data on the same.
- 2. Description of the Related Art
- Compact discs (CDs) and digital versatile discs (DVDs) are the most popular types of data storage media. In general, user data is recorded on pits of a recording layer of a read-only optical disc and recorded by changing a phase of a phase change material (PCM) on the recording layer of a rewritable optical disc which is covered with the PCM.
- A pickup, which is included in an optical disc reproducing apparatus, detects a precise position of a track in which the user data is recorded, receives a laser beam reflected from the track, and reads the user data from the laser beam. A signal that the pickup uses to detect a position of a desired track is called a tracking signal. The tracking signal is obtained when a photo diode, which has a plurality of light receiving parts, receives the laser beam. Signals are generated from lights received by the respective light receiving parts, and then, the signals are added together or subtracted from each other. The tracking signal curves like an S-shape and right and left sides of the tracking signal, which are divided with respect to a central point of the tracking signal, have opposite polarities.
- The polarities of the tracking signal change according to a type of the optical disc or physical characteristics of the recording layer on the optical disc, such as the physical characteristics of the pit or the track. In other words, the polarities of the tracking signal change from (−) to (+) and from (+) to (−) according to the type of optical disc or the physical characteristics of the recording layer. Therefore, when the optical disc is loaded into a conventional optical disc reproducing apparatus, the apparatus determines the polarity of a tracking signal by trial and error, detects the position of the track in which the user data is recorded based on the polarity, and reads the user data from the track. That is, the conventional optical disc reproducing apparatus spends considerable time in detecting the polarity of the tracking signal before reading the user data, thereby delaying a reproduction of the user data.
- Meanwhile, a reflectivity of the optical disc is a ratio of a power of the laser beam reflected from the recording layer of the optical disc to the power of the laser beam incident on the recording layer. The reflectivity also depends on the type of optical disc or the physical characteristics of the recording layer, and therefore, the conventional optical disc reproducing apparatus detects the reflectivity by trial and error.
- The present invention provides an optical disc from which information regarding a polarity of a tracking signal and/or a reflectivity is easily recognized, and apparatuses and methods for recording and reproducing information on the same.
- Additional aspects and/or advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
- According to an aspect of the present invention, there is provided an optical disc including a clamping area; a lead-in area; a data area; and a burst cutting area (BCA) which is present between the clamping area and the lead-in area and in which information regarding the optical disc is recorded, wherein the information is read before performing tracking in the data area.
- According to an aspect of the present invention, the information regarding the optical disc is at least one of tracking polarity information and reflectivity information, and the tracking polarity information and the reflectivity information are recorded with a pattern of crystalline or non-crystalline marks.
- According to an aspect of the present invention, the recording of the tracking polarity information begins at leading bytes in the BCA and is repeatedly recorded.
- According to an aspect of the present invention, first two bits of the leading bytes of the tracking polarity information include identifiers of the respective tracking polarity information that is repeatedly recorded several times, and other six bits include remaining information of the tracking polarity information.
- According to an aspect of the present invention, one of the six bits includes flag information that indicates whether other information is recorded in the BCA, and the other five bits of the six bits include the tracking polarity information that indicates a polarity of a tracking signal related to each recording layer of the optical disc.
- According to another aspect of the present invention, there is provided an optical disc including a first recording layer in which a first lead-in area, a first data area, and a first lead-out area are formed; and a second recording layer in which a second lead-in area, a second data area, and a second lead-out area are formed, wherein at least one of the first and second recording layers includes a burst cutting area (BCA), in which information regarding the optical disc is recorded, and the information is read before performing tracking in the first and second data areas.
- According to an aspect of the present invention, the information regarding the optical disc is at least one of tracking polarity information and reflectivity information, and the tracking polarity information and the reflectivity information are recorded with a pattern of crystalline or non-crystalline marks.
- According to an aspect of the present invention, the recording of the tracking polarity information begins in leading bytes in the BCA and is repeatedly recorded.
- According to yet another aspect of the present invention, there is provided a method of recording information on an optical disc that has at least one recording layer, the method including recording at least one of tracking polarity information and reflectivity information in a burst cutting area (BCA) of the recording layer.
- According to still another aspect of the present invention, there is provided a method of reproducing information on an optical disc which has at least one recording layer, the method including reading tracking polarity information in a burst cutting area (BCA) of the recording layer, and analyzing the read tracking polarity information, outputting an analysis result indicative thereof, performing tracking in the recording layer of the optical disc using the analysis result, and recording or reproducing user data on the optical disc.
- According to still another aspect of the present invention, there is provided a method of reproducing information on an optical disc which has at least one recording layer, the method including reading reflectivity information in a burst cutting area (BCA) of the recording layer; and analyzing the reflectivity information and outputting an analysis result indicative thereof, adjusting the write or read power of a laser beam using the analysis result, and recording or reproducing user data on the optical disc.
- According to still another aspect of the present invention, there is provided an optical disc recording apparatus including a controller creating at least one of tracking polarity information and reflectivity information; and a recording unit recording the at least one of tracking information and reflectivity information created by the controller in a a burst cutting area (BCA) of an optical disc.
- According to still another aspect of the present invention, there is provided an optical disc reproducing apparatus including a reading unit reading at least one of tracking polarity information and reflectivity information from a burst cutting area (BCA) of an optical disc, and a controller analyzing the information read by the reading unit and outputting an analysis result indicative thereof, and recording or reproducing user data on the optical disc using the analysis result.
- According to an aspect of the present invention, there is provided an optical disc, comprising: a first recording layer formed on the optical disc; a second recording layer formed on the optical disc, wherein the first recording layer and a second recording layer each comprise a clamping area, a burst cutting area (BCA), a lead-in area, and a lead-out area, wherein the clamping area is an area that is pressurized to clamp the optical disc, and the BCA is an area in which tracking polarity information and/or reflectivity information is recorded; and a data area recording user data between the lead-in area and the lead-out area.
- The above and/other other aspects and advantages of the present invention will become more apparent by describing in detail aspects thereof with reference to the attached drawings in which:
FIG. 1 is a schematic block diagram of an optical disc recording apparatus, according to an aspect of the present invention;FIG. 2 is a schematic block diagram of an optical disc reproducing apparatus, according to an aspect of the present invention;FIG. 3 is a schematic block diagram of an optical disc, according to an aspect of the present invention;FIGS. 4A and 4B are schematic block diagrams of the optical disc, according to another aspect of the present invention;FIGS. 5A and 5B are schematic block diagrams of the optical disc according to still another aspect of the present invention;FIG. 6A illustrates a data structure of a burst cutting area (BCA) of the optical disc, according to an aspect of the present invention;FIG. 6B illustrates the data structure of the BCA of the optical disc, according to another aspect of the present invention;FIG. 7 illustrates the data structure of information recorded on the BCA of the optical disc, according to an aspect of the present invention;FIG. 8 is a flowchart illustrating a method of reproducing data from the optical disc, according to an aspect of the present invention; andFIG. 9 is a flowchart illustrating the method of reproducing data from the optical disc, according to another aspect of the present invention.- Reference will now be made in detail to the present aspects of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. The aspects are described below in order to explain the present invention by referring to the figures.
FIG. 1 is a schematic block diagram of an optical disc recording apparatus, according to an aspect of the present invention. Referring toFIG. 1 , the recording apparatus includes arecording unit 1 and acontroller 2 to record information regarding a polarity of a tracking signal and/or a reflectivity of anoptical disc 100 on a burst cutting area (BCA) on theoptical disc 100. Thecontroller 2 creates the information regarding the polarity of the tracking signal and/or the reflectivity of the BCA and therecording unit 1 records at least one of tracking polarity information and reflectivity information on the BCA. Thus, the BCA of theoptical disc 100, according to an aspect of the present invention, includes the tracking polarity information and/or the reflectivity information.FIG. 2 is a schematic block diagram of an optical disc reproducing apparatus, according to an aspect of the present invention. Referring toFIG. 2 , the reproducing apparatus includes areading unit 4 and acontroller 5. Thereading unit 4 reads the tracking polarity information and/or the reflectivity information from the BCA on theoptical disc 100, according to an aspect of the present invention, and provides an analysis result indicative thereof to thecontroller 5. Then, thecontroller 5 analyzes the tracking polarity information and/or the reflectivity information and reproduces user data from theoptical disc 100 based on the analysis result.- The recording apparatus of
FIG. 1 is an apparatus used in a mastering process by a disc manufacturer. The reproducing apparatus ofFIG. 2 is an apparatus to reproduce the tracking polarity information and/or the reflectivity information, not the user data, from the BCA. Thus, the reproducing apparatus ofFIG. 2 can be included in both the optical disc recording apparatus and the optical disc reproducing apparatus because the reproduction of the above information can be carried out when recording or reproducing the user data on theoptical disc 100. FIG. 3 is a schematic block diagram of theoptical disc 100, according to an aspect of the present invention. Referring toFIG. 3 , a first recording layer l0 is formed on theoptical disc 100. The first recording layer l0 includes a clamping area C, the BCA B, a lead-in area LI, and a lead-out area LO. The clamping area C is an area that is pressurized by a clamping tool in order to clamp theoptical disc 100. In general, the clamping area C is circular band shaped and formed in an inner portion of theoptical disc 100. The BCA B is an area in which the tracking polarity information and/or the reflectivity information is recorded. The particulars of theoptical disc 100, such as a corresponding serial number and manufacturing date, may be further recorded in the BCA B. A data area in which the user data is recorded, is present between the lead-in area LI and the lead-out area LO. If the first recording layer l0 is formed of a phase change material (PCM), the tracking polarity information and/or the reflectivity information may be recorded with a pattern of crystalline and/or non-crystalline marks. A method of recording information in the BCA B is disclosed in Korean Patent Application No. 2001-47957 entitled “Optical Disc and Methods for Recording and Reproducing Essential Information of Optical Disc,” also filed by the present applicant.FIGS. 4A and 4B are schematic block diagrams of theoptical disc 100, according to another aspect of the present invention. Referring toFIGS. 4A and 4B , the first recording layer l0 and a second recording layer l1 are formed on theoptical disc 100. Each of the first recording layer l0 and the second recording layer l1 includes the clamping area C, the lead-in area LI, and the lead-out area LO. The data area in which the user data is recorded is present between the lead-in area LI and the lead-out area LO. The clamping area C, the lead-in area LI, and the lead-out area LO are the same as those explained with respect toFIG. 3 , and therefore, their descriptions will not be repeated here. Further, the BCA B is present between the clamping area C and the lead-in area LI of the first recording layer l1. The tracking polarity information and/or the reflectivity information is recorded in the BCA B, according to an aspect of the present invention. The particulars of theoptical disc 100, such as the corresponding serial number and the manufacturing date, may be further recorded in the BCA B. If the first recording layer l0 is formed of the phase change material (PCM), the tracking polarity information and/or the reflectivity information may be recorded with the pattern of the crystalline and/or the non-crystalline marks.FIGS. 5A and 5B are schematic block diagrams of theoptical disc 100, according to still another aspect of the present invention. Referring toFIGS. 5A and 5B , the first recording layer l0 and the second recording layer l1 are formed on theoptical disc 100. Each of the first recording layer l0 and the second recording layer l1 includes a clamping area C, a lead-in area LI, and a lead-out area LO. The data area in which the user data is recorded is present between the lead-in area LI and the lead-out area LO. The clamping area C, the lead-in area LI, and the lead-out area LO are the same as those explained with respect toFIG. 3 , and therefore, their descriptions will not be repeated here. According to an aspect of the present invention, the BCA B is formed on the second recording layer l1, unlike inFIGS. 4A and 4B in which the BCA B is present on the first recording layer l0. That is, the BCA B ofFIGS. 5A and 5B is present between the clamping area C and the lead-in area LI of the second recording layer l1. If the second recording layer l1 is formed of the phase change material (PCM), the tracking polarity information or reflectivity information may be recorded with a pattern of crystalline and/or non-crystalline marks.- In conclusion, the
optical disc 100 ofFIGS. 5A and 5B is different from that ofFIGS. 4A and 4B in that the BCA B is present in the second recording layer, not the first recording layer. FIG. 6A illustrates a data structure of the BCA of theoptical disc 100, according to an aspect of the present invention. Referring toFIG. 6A , the tracking polarity information is recorded in the BCA, according to an aspect of the present invention. The tracking polarity information provides the polarity of the tracking signal related to theoptical disc 100. The tracking signal curves like an S-shape and corresponding right and left sides, which are divided with respect to the central point of the tracking signal, have opposite polarities. The polarity of the tracking signal changes according to a type of theoptical disc 100, or physical characteristics of the recording layer such as the physical characteristics of a pit or a track. In other words, the polarities of the tracking signal change from (−) to (+) and (+) to (−) according to the type of theoptical disc 100 or the physical characteristics of the recording layer. The particulars of theoptical disc 100 may be further recorded in the BCA, as well as the tracking polarity information.FIG. 6B illustrates a data structure of the BCA of theoptical disc 100, according to another aspect of the present invention. The tracking polarity information and/or the reflectivity information is recorded in the BCA, according to an aspect the present invention. Here, the tracking polarity information is as described with reference toFIG. 6A . The reflectivity information provides the reflectivity of theoptical disc 100, which is a ratio of the power of a laser beam reflected from the recording layer of theoptical disc 100 to the power of the laser beam incident on the recording layer. The reflectivity also changes according to the type of theoptical disc 100 or the physical characteristics of the recording layer.- Meanwhile, the tracking polarity information is recorded in both the BCAs of
FIGS. 6A and 6B , but only the reflectivity information can be recorded if needed. FIG. 7 illustrates a data structure of the information recorded in the BCA of theoptical disc 100, according to an aspect of the present invention. In detail,FIG. 7 shows an example of the BCA in theoptical disc 100 having two recording layers as shown inFIGS. 4 and 5 . The tracking polarity information is repeatedly recorded four times in the BCA and the recording begins at leading bytes of the BCA. First two bits b1b0 of the tracking polarity information are identifiers of the respective information that is repeatedly recorded. If the first two bits b1b0 are 00, the information indicates that first tracking polarity information is recorded in the BCA. If the first two bits b1b0 are 01, the information indicates that second tracking polarity information is recorded in the BCA. If the first two bits b1b0 are 10 the information indicates that third tracking polarity information is recorded in the BCA. If the first two bits b1b0 are 11, the information indicates that fourth tracking polarity information is recorded in the BCA. Repetitive recording of the information increases a robustness of the information. Even if an error occurs in one of the repeated recordings, it is possible to read desired information from the other recordings. The other six bits b7b6b5b4b3b2 provide the information. The bit b2 includes flag information indicating whether or not other information, i.e., the particulars of theoptical disc 100, is recorded in the BCM. If the bit b2 is 0, the information indicates that the other information is not recorded in the BCM. If the bit b2 is 1, the information indicates that the other information is recorded in the BCM. The bits b7b6b5b4b3 represent the tracking polarity information and can be defined as follows:- 00000: first recording layer=type A, second recording layer=type B
- 00001: first recording layer=type B, second recording layer=type A
- 00010: first recording layer=second recording layer=type A
- 00011: first recording layer=second recording layer=type B
- For instance, when the other information is not recorded in the BCA, and the polarities of the tracking signals related to the first and second recording layers are type B and type A, respectively, the six bits b7b6b5b4b3b2 is expressed as ‘000010’. When the other information, such as the particulars of the
optical disc 100, is recorded in the BCA and both polarities of the tracking signals related to the first and second recording layers are type A, the six bits b7b6b5b4b3b2 is expressed as ‘000101’. - If 1 byte is not enough to express the tracking polarity information, for example, if the number of recording layers is more than 2, it is possible to express the tracking polarity information using additional bits in addition to the 1 byte.
- When the
optical disc 100 is loaded into a disc drive of the optical disc reproducing apparatus, the disc drive easily accesses leading bytes of the BCA so as to read the tracking polarity information and/or the reflectivity information. Accordingly, the recording of the tracking polarity information and/or reflectivity information may begin on the leading bytes of the BCA. - A method of reproducing the data from the
optical disc 100, according to an aspect of the present invention, will now be described. As mentioned above, the data that is reproduced using the method is not the user data, but the tracking polarity information and/or the reflectivity information recorded in a BCA of theoptical disc 100. The reproduction of such data can be performed both when recording and reproducing the user data in a data area. FIG. 8 is a flowchart illustrating the method of reproducing the data from theoptical disc 100, according to an aspect of the present invention. Referring toFIG. 8 , atoperation 801, when theoptical disc 100 is loaded into the disc drive of the reproducing apparatus ofFIG. 2 , atoperation 802 the optical pickup included in the disc drive reads the tracking polarity information from the BCA of theoptical disc 100. Atoperation 803, the reproducing apparatus (or the disc drive) performs the tracking on theoptical disc 100 using the read tracking polarity information without trial and error, and records or reproduces the user data in a data area of theoptical disc 100. In other words, the optical pickup provides the tracking polarity information to the disc drive, and then, the disc drive controls the optical pickup using the information to perform the recording or the reproducing of the user data on theoptical disc 100.FIG. 9 is a flowchart illustrating the method of reproducing the data from theoptical disc 100, according to another aspect of the present invention. ReferringFIG. 9 , atoperation 901, when theoptical disc 100 is loaded into the disc drive of the reproducing apparatus ofFIG. 2 , atoperation 902, the optical pickup included in the disc drive reads reflectivity information from the BCA of theoptical disc 100. Atoperation 903, the reproducing apparatus (or the disc drive) adjusts the write/read power of the laser beam using the read reflectivity information without trial and error, and records or reproduces the user data in the data area of theoptical disc 100. In other words, the optical pickup provides the reflectivity information to the disc drive, and then, the disc drive controls the optical pickup using the information to perform the recording or the reproducing of the user data on theoptical disc 100.- As described above, tracking polarity information and/or reflectivity information is recorded in a BCA of an optical disc according to an aspect of the present invention. Accordingly, it is possible to obtain the tracking polarity information and/or reflectivity information without trial and error and directly record or reproduce user data in a data area of the optical disc.
- Although a few aspects of the present invention have been shown and described, it would be appreciated by those skilled in the art that changes may be made in this aspect without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents.
Claims (1)
1. A method for processing data recorded in an information storage medium comprising a first recording layer and a second recording layer, each of the recording layers comprising a data area, the method comprising:
reproducing information regarding the information storage medium from a burst cutting area in at least one of the first recording layer and the second recording layer before tracking the corresponding data area,
wherein the information regarding the information storage medium comprises tracking polarity information for each of the first and second recording layers.
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| KR2002-67968 | 2002-11-04 | ||
| US10/695,393US7362691B2 (en) | 2002-11-04 | 2003-10-29 | Optical disc having tracking polarity information, and apparatuses and methods for recording and reproducing user data on the same |
| US11/959,865US20080094985A1 (en) | 2002-11-04 | 2007-12-19 | Optical disk having tracking polarity information, and apparatuses and methods for recording and reproducing user data on the same |
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