D-Link DSN-640, HDD, Serial ATA II, Rack (2U), Gray D-Link DSN-640. Installed storage drive type: HDD, Storage drive interface: Serial ATA II. Chassis type: Rack (2U). Number of storage drives supported: 60, Supported storage drive types: HDD. Width: 17.4" (442.8 mm), Depth: 19.7" (500.6 mm), Height: 3.46" (88 mm). Product color: Gray