SanDisk Ultra 3D NAND 2.5" SATA SSD, Up to 560MB/s Read, SATA III, 500GB–4TB

SanDisk's 3D NAND SATA line runs to 4TB, which is more than most 2.5-inch drives reach and the reason to consider it for a bulk library in a machine with no M.2 socket.

Writes are absorbed by nCache 2.0, an SLC buffer rather than a DRAM cache, so a very large single transfer tapers once that buffer is spent. Endurance is rated at 600TBW on the 4TB.