1 Reply Latest reply: Jan 12, 2013 5:59 PM by Walter Apple
Walter Apple Level 1 Level 1

I followed the steps on Option 2 in order to format my external hard drive (a WD My Book Essential 1TB).


Terminal tried to unmount it but "couldn't open the device" (error -69877).


Not sure what to try now. Help would be greatly appreciated.

MacBook Pro, OS X Mountain Lion (10.8.2)
Solved by Walter Apple on Jan 12, 2013 5:59 PM Solved

I was able to solve this by going into recovery mode and repairing the drive's partition.