HP StorageWorks DAT 72 USB External Drive, StorageWorks. Native capacity: 36 GB, Compressed capacity: 72 GB. Sustained data transfer rate (compressed): 6.4 MB/s, Sustained data transfer rate (native): 3.2 MB/s. Drive device, buffer size: 8 MB, Buffer size: 8000 KB. Serial interface type: USB 2.0. Dimensions (WxDxH): 224.8 x 320 x 279.9 mm, Weight: 2.27 kg, Size: 177.8 mm (7 ")