My Book is a series of external hard drives produced by Western Digital. There are currently nine series of My Book drives; Essential Edition, Home Edition, Office Edition, Mirror Edition, Studio Edition, Premium Edition, Elite Edition, Pro Edition, AV Dvr "Live Edition", and the World Edition.
Dong Ngo wrote a review for cnet.com, here is the bad, "The My Book doesn't support USB-C. Instead, it uses the old Micro-USB 3.0 port and includes a foot-long connection cable. This means it won't work with computers that only have a USB-C port, like the Macbook. The My Book doesn't have extra USB ports to work as a USB hub, a cool feature first introduced by the Seagate Backup Plus Hub. And like all desktop external hard drive, the My Book require an external power adapter to work."