Western Digital's hard drive encryption is useless. Totally useless
Found on The Register on Wednesday, 21 October 2015
On some models, the drive's encryption key can be trivially brute-forced, which is bad news if someone steals the drive: decrypting it is child's play. And the firmware on some devices can be easily altered, allowing an attacker to silently compromise the drive and its file systems.
Drives using a Symwave 6316 controller store their encryption keys on the disk, encrypted with a known hardcoded AES-256 key stored in the firmware, so recovery of the data is trivial.
All-in-one products are rarely what they promise. Don't rely on some custom solution which is limited to a single manufacturer, but instead use a cross-platform encryption which has been tested.