SanDisk Extreme 900 Portable SSD 480GB (SDSSDEX2-480G-G25) Storage Capacity: 480GB Solid State Drive. Read Speed: up to 850 MB/s Write Speed: up to 850 MB/s Interface: USB 3.1 Gen 2. Dimensions (H x W x L): 5.25 x 3.25 x 0.70 in (133.35 x 82.55 x 17.78 mm).