Capacity 500gb 750gb 1tb form factor 25quot colour black white material plastic led display yes interface super fast usb port 30 maximum data transfer rate reading 6500 mbs 436 x writing 9500 mbs 637 x rpm cache 5400umin 8mb file format fat 32 power supply usb port 30 downwardly compatible weight 165g accessories usb 30 cable downwardly compatible operating system mac os 10x microsoft windows xpvista7 supported operating systems mac os 10x microsoft window