Silverstone DS321. Storage media type: HDD, Storage drive interface: Serial ATA, Storage drive sizes supported: 88.9 mm (3.5 "). AC input voltage: 100-240 V, AC input frequency: 50/60 Hz, Output voltage: 12 V. Width: 81 mm, Depth: 182 mm, Height: 123 mm. Mac operating systems supported: Mac OS X 10.4 Tiger, Mac OS X 10.5 Leopard, Mac OS X 10.6 Snow Leopard, Mac OS X 10.7 Lion. Certification: UL, cUL, CE, TUV