Brand: wd (western digital)model: my book (part number: wdbbgb0040hbk-eesn)storage capacity: 4 tb (4,000 gb)form factor / size: 3.5-inch desktop hard driveinterface / connection: usb 3.0 (usb 3.2 gen 1 compliant, backward compatible with usb 2.0)data transfer speed: up to 5 gbps via usb 3.0security & protection: built-in 256-bit aes hardware encryption with password protection via wd security software.backup compatibility: includes automated wd backup software for windows systems and is fully compatible with apple time machine for macos.power requirement: requires an external ac power adapter