Hi,
Please see if the following link helps.
http://wdc.custhelp.com/app/answers/detail/a_id/3865/session/L3RpbWUvMTQwNzk1NTAyMC9zaWQvRVo1a05MX2w%3D/kw/how%20to%20format/session/L3RpbWUvMTQwNzk1NTAyMC9zaWQvRVo1a05MX2w=
Try formatting the drive again following the instrucions from the link above.