DELL PowerVault MD3400, 4 TB, HDD, Serial ATA, 3.5", Rack (2U), Black, Silver DELL PowerVault MD3400. Total installed storage capacity: 4 TB, Installed storage drive type: HDD, Storage drive interface: Serial ATA, Storage drive size: 3.5". Chassis type: Rack (2U). Number of storage drives supported: 12, Supported storage drive types: HDD & SSD. Width: 17.6" (446.3 mm), Depth: 23.7" (602 mm), Height: 3.42" (86.8 mm), Weight: 64.6 lbs (29.3 kg). Product color: Black, Silver