HP MSA2 500GB 7.2K 3.5-inch SATA HDD. Hard drive interface: Serial ATA, Hard drive capacity: 500 GB, Hard drive size: 8.89 cm (3.5"). Weight: 2.27 kg. Compatibility: StorageWorks MSA2, Dimensions (WxDxH): 317.5 x 215.9 x 165.1 mm, Size: 31.75 cm (12.5"). Weight: 2.27 kg (5 lbs)