MyBook error need to format

Hello and welcome to the WD community.

Since the drive does come up on the computer, have you tried using data recovery software to see if you can recover your files? Normally, if you are able to see the drive on the computer in any way you are able try data recovery software.

You can also check the following link to see data recovery partners, some of the companies have free diagnostic of the drive hope this is helpful:

http://support.wdc.com/recovery/index.asp?wdc_lang=en