The Western Digital SN7100 is a solid-state drive in the M.2 2280 form factor, launched on November 21st, 2024. It is available in capacities ranging from 500 GB to 2 TB. This page reports specifications for the 2 TB variant. With the rest of the system, the Western Digital SN7100 interfaces using a PCI-Express 4.0 x4 connection. The SSD controller is the Polaris 3 A101-000172-A1 from WD, a DRAM cache is not available. Western Digital has installed 218-layer TLC NAND flash on the SN7100, the flash chips are made by Kioxia. To improve write speeds, a pseudo-SLC cache is used, so bursts of incoming writes are absorbed more quickly. The cache is sized at 650 GB. Copying data out of the SLC cache (folding) completes at 800 MB/s. Thanks to support for the fast PCI-Express 4.0 interface, performance is excellent. The SN7100 is rated for sequential read speeds of up to 7,250 MB/s and 6,900 MB/s write; random IO reaches 1000K IOPS for read and 1400K for writes.
At its launch, the SSD was priced at 140 USD. The warranty length is set to five years, which is an excellent warranty period. Western Digital guarantees an endurance rating of 1200 TBW, a typical value for consumer SSDs.