Freecom Hard Drive Secure, Secure. Hard drive capacity: 500 GB, Hard drive interface: Serial ATA, Hard drive size: 88.9 mm (3.5 "). Colour of product: Black, Silver. Mac operating systems supported: Mac OS X 10.4 Tiger. Weight: 1.4 kg, Width: 155 mm, Depth: 148 mm. Operating temperature range (T-T): 10 - 35 °C, Storage temperature range (T-T): -20 - 70 °C