Plextor 256GB M5S. Solid-state drive capacity: 256 GB, Size: 63.5 mm (2.5 "), Solid-state drive interfaces: Serial ATA III. Read speed: 520 MB/s, Write speed: 390 MB/s, Random write (4KB): 70 IOPS. Power consumption (standby): 0.25 W. Mean time between failures (MTBF): 1500000 h. Operating temperature range (T-T): 0 - 70 °C, Operating shock: 1500 G, Operating vibration: 2.17 G