The SanDisk X400 was a solid-state drive in the 2.5" form factor, launched on January 5th, 2016, that is no longer in production. It was available in capacities ranging from 512 GB to 1 TB. This page reports specifications for the 512 GB variant. With the rest of the system, the SanDisk X400 interfaces using a SATA 6 Gbps connection. The SSD controller is the 88SS1074 Dean from Marvell, a DRAM cache chip is available. SanDisk has installed 64-layer TLC NAND flash on the X400, 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, once it is full, writes complete at 258 MB/s. The X400 is rated for sequential read speeds of up to 540 MB/s and 520 MB/s write; random IO reaches 93K IOPS for read and 75K for writes.
At its launch, the SSD was priced at 125 USD. The warranty length is set to five years, which is an excellent warranty period. SanDisk guarantees an endurance rating of 160 TBW, a relatively low value compared to other SSDs.