The Western Digital SN580 is a solid-state drive in the M.2 2280 form factor, launched on June 19th, 2023. It is available in capacities ranging from 250 GB to 2 TB. This page reports specifications for the 2 TB variant. With the rest of the system, the Western Digital SN580 interfaces using a PCI-Express 4.0 x4 connection. The SSD controller is the 20-82-10082-A1 Polaris MP16+ from WD, a DRAM cache is not available. Western Digital has installed 112-layer TLC NAND flash on the SN580, 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. Thanks to support for the fast PCI-Express 4.0 interface, performance is excellent. The SN580 is rated for sequential read speeds of up to 4,150 MB/s and 4,150 MB/s write; random IO reaches 600K IOPS for read and 750K for writes.
At its launch, the SSD was priced at 93 USD. The warranty length is set to five years, which is an excellent warranty period. Western Digital guarantees an endurance rating of 900 TBW, a relatively low value compared to other SSDs.