The Western Digital SN350 is a solid-state drive in the M.2 2280 form factor, launched on February 15th, 2021. It is available in capacities ranging from 1 TB to 2 TB. This page reports specifications for the 2 TB variant. With the rest of the system, the Western Digital SN350 interfaces using a PCI-Express 3.0 x4 connection. The SSD controller is the 20-82-01008-A2 Polaris MP16 from WD, a DRAM cache is not available. Western Digital has installed 96-layer QLC NAND flash on the SN350, the flash chips are made by Toshiba. Please note that this SSD is sold in multiple variants with different NAND flash or controller, which could affect performance, the "Notes" section at the end of this page has more info. To improve write speeds, a pseudo-SLC cache is used, so bursts of incoming writes are absorbed more quickly. The cache is sized at 480 GB, once it is full, writes complete at 180 MB/s. The SN350 is rated for sequential read speeds of up to 3,200 MB/s and 3,000 MB/s write; random IO reaches 500K IOPS for read and 450K for writes.
At its launch, the SSD was priced at 44 USD. The warranty length is set to three years, which is above average, but shorter than the five years offered by many other vendors. Western Digital guarantees an endurance rating of 100 TBW, a very low value compared to other SSDs.