Attempted to remove WD My Book from Enclosure and Put In Internal Bay

WD External Drives External Drives for Mac
2

Hi ecceben, sorry to hear you are having problems with your drive, note that removing the hard drive from the enclosure will void the warranty. As you said the hard drive could have been damaged when being moved out of the enclosure. If you don’t need to recover the files from the external drive you can try writing zeros using the Disk Utility app. Check the link below for more information. 

http://support.apple.com/kb/HT3680