Samsung 256GB 830 Series 2.5". Solid-state drive capacity: 256 GB, Size: 63.5 mm (2.5 "), Solid-state drive interfaces: Serial ATA, Serial ATA II, Serial ATA III. Read speed: 520 MB/s, Write speed: 400 MB/s, Random write (4KB): 30000 IOPS. Operating voltage: 5 V, Power consumption (read): 0.12 W, Power consumption (write): 0.12 W. Operating temperature range (T-T): 0 - 60 °C. Weight: 63.5 g, Depth: 100 mm, Width: 69.85 mm