SanDisk SN7100 WDS400T4X0E-00CJA0 4TB M.2 2280 PCIe 4.0 x4 internal SSD

Four-terabyte PCIe 4.0 NVMe drive

The SanDisk SN7100 WDS400T4X0E-00CJA0 is a consumer-grade internal SSD built on the M.2 2280 form factor. It uses TLC 3D NAND and a DRAM-less design with host memory buffer support. The drive targets gamers and creators who need large capacity in laptops or handheld devices. Sequential reads reach up to 7000 MBps and writes up to 6700 MBps.

PCIe 4.0 x4 interface limits

The PCI-Express 4.0 x4 link caps theoretical throughput at roughly 8 GBps, so real-world peaks sit near the quoted 7000 MBps read and 6700 MBps write. Random performance reaches 900,000 IOPS read and 1,350,000 IOPS write within that bandwidth envelope. Systems limited to PCIe 3.0 will halve the available ceiling. The drive operates without a heatsink, relying on the host thermal solution.

2400 TBW endurance rating

The 4TB model carries a 2400 terabytes written rating backed by a 1,750,000-hour MTBF figure. That endurance level suits heavy write workloads such as gameplay streaming, capture and content creation. Buyers should match the TBW expectation to their projected daily write volume to confirm suitability.