To anyone able to help with this issue.
I have a my passport essential se (wdbacx0010bbk-nesn) and are unable to backup my computer running win 7.
The drive is recognized however, when I try to complete backup using windows backup/restore it fails.
It will say backup in progress for a short time then will switch to check your backup- the last backup did not complete successfully.
I had to remove the installed WD software as it was using over 70% of the 4 gig memory and would pretty much cause all other programs to stop working.