The Western Digital SN730 is a solid-state drive in the M.2 2280 form factor, launched in 2019. It is available in capacities ranging from 256 GB to 1 TB. This page reports specifications for the 1 TB variant. With the rest of the system, the Western Digital SN730 interfaces using a PCI-Express 3.0 x4 connection. The SSD controller is the 20-82-00705-A2 Triton MP28 from WD, a DRAM cache chip is available. Western Digital has installed 96-layer TLC NAND flash on the SN730, the flash chips are made by Toshiba. To improve write speeds, a pseudo-SLC cache is used, so bursts of incoming writes are handled more quickly. The cache is sized at 16 GB, once it is full, writes complete at 1800 MB/s. The SN730 is rated for sequential read speeds of up to 3,400 MB/s and 3,100 MB/s write; random IO reaches 550K IOPS for read and 550K for writes.
The SSD's price at launch is unknown. The warranty length is set to five years, which is an excellent warranty period. Western Digital guarantees an endurance rating of 400 TBW, a relatively low value compared to other SSDs.