WD My Book Essential 2TB Shuts Down During Backup - Mac MacBook OSX 10.6.8

krislakin,

It is not normal for a disk drive to shut down while in backup duty. i would recommend changing the power adapter and running a diagnostic test using your Apple Mac OS system’s Disk Utility, as instructed in the following link:

http://wdc.custhelp.com/app/answers/detail/a_id/866/