Vinpower Digital SharkNet. Hard drive capacity: 250 GB, Supported hard disk drive interfaces: Serial ATA. DVD+R write speed: 24 x, DVD+R Double Layer write speed: 12 x, DVD-R write speed: 24 x. Compatible operating systems: Windows 7/Vista/XP. Input voltage: 90 - 240 V, Power supply: 500 W. Operating relative humidity range: 20 - 80 %, Operating temperature range (T-T): 5 - 40 °C