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The WD_Black SN7100 is a PCIe Gen4 x4 M.2 2280 SSD built on TLC 3D NAND, rated for up to 7,000 MB/s sequential read and 6,700 MB/s sequential write. The 4TB model carries a 2,400 TBW endurance rating and a 5-year limited warranty. It is a DRAM-less design that leans on host memory buffering, so it competes on capacity and endurance rather than on sustained heavy-write speed. It suits gamers, console expanders and laptop or desktop builders who want a large, fast Gen4 drive without paying Gen5 prices.
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Owners and reviewers treat the SN7100 as a solid mainstream Gen4 drive: fast in everyday use and games, with strong endurance for the capacity. Criticism centers on sustained write speed once the cache fills and on the lack of a heatsink.
The WD_Black SN7100 is a 4 TB NVMe solid-state drive in the M.2 2280 form factor. It uses TLC 3D NAND and connects over a PCIe Gen4 x4 interface.
It reads sequentially at up to 7000 MB/s and writes at up to 6700 MB/s. Random performance is up to 900K IOPS for reads and 1350K IOPS for writes. Endurance is rated at 2400 TBW.
