The Western Digital SN500 is a solid-state drive in the M.2 2280 form factor, launched on March 14th, 2019. It is available in capacities ranging from 250 GB to 500 GB. This page reports specifications for the 250 GB variant. With the rest of the system, the Western Digital SN500 interfaces using a PCI-Express 3.0 x2 connection. The SSD controller is the 20-82-007010 Triton MP28 from WD. Western Digital has installed 64-layer TLC NAND flash on the SN500, the flash chips are made by Toshiba. To improve write speeds, a pseudo-SLC cache is used, so bursts of incoming writes are processed more quickly. The cache is sized at 3 GB. The SN500 is rated for sequential read speeds of up to 1,700 MB/s and 1,300 MB/s write; random IOPS reach up to 210K for reads and 170K for writes.
At its launch, the SSD was priced at 55 USD. The warranty length is set to five years, which is an excellent warranty period. Western Digital guarantees an endurance rating of 150 TBW, a typical value for consumer SSDs.