2.5" SSD 4.0TB Verbatim VI550 S3, SATAIII, Sequential Reads: 510 MB/s, Sequential Writes: 450 MB/s, Maximum Random 4k: Read: 71,262 IOPS / Write: 85,241 IOPS, Thickness- 7mm, Controller Phison PS3111, TBW Rating: 1000TB, 3D NAND TLC