Following is the reply from WD support team:
Thank you for contacting Western Digital Customer Service and Support. My name is [Deleted].
We no longer measure the reliability of our hard drives using Mean Time Between Failure (MTBF). Our current drive reliability is measured using Component Design Life (CDL) and Annualized Failure Rate (AFR). The Component Design Life of the drive is 5 years and the Annualized Failure Rate is less than 0.8%.
The power consumption and load/unload cycle count of the drive cannot be determined since it depends on the drive used inside and we don’t always use the same drive inside a WD external enclosure. The plug design is rated for at least 10,000 connect-disconnect cycles. WD Smartware drives use a 128-bit hardware-based AES encryption.
If you have any further questions, please reply to this email and we will be happy to assist you further.
Western Digital Service and Support