The My Book Duo is a 20TB desktop RAID external hard drive. It features two 3.5-inch drive bays, each containing a 10TB hard drive. The device includes a USB-C 3.2 Gen 1 port and a 2-port USB-A 3.2 Gen 1 hub. It comes pre-formatted in NTFS for Windows systems and supports AES 256-bit hardware encryption. A USB-C to USB-A cable is included.