RPM: 5400 RPM Form Factor: 2.5" Interface: USB 2.0 Cache: 8MB Dimensions: Length: 121 mm (4.75") Width: 88 mm (3.45") Height: 16 mm (0.63") Weight: 0.20 kg (0.44 lbs) Features: Platform Support: PC Mac Default Format: Macintosh Extended (HFS+) Transfer rate (maximum — USB 2.0): 480Mbits/s Hot Swappable: Yes Compatibility: USB 1.1 Plug n Play Package Contents: eGo Helium portable hard drive. USB 1.1/2.0 power cable. Quick Install guide. Backup software license included, software via download.