If you want to use the drive as an external drive in the MyBook enclosure you MUST format it with the WD tools ( WD Quick formatter for Windows). You will be able to remove the first partition of the disk with the Smartwave software and end with a simple 3TB drive.
If you want to use the HD as an internal drive, you can open the enclosure and connect the HD to the PC, then format it.
But in all cases : the data on a MyBook is encryted by the USB-SATA bridge board, therefore you have to either format the drive while still in the enclosure to use it as an external drive, or (re)format it in a PC to use it as an internal drive.
