1 Reply Latest reply: Jan 12, 2013 5:59 PM by Walter Apple
Walter Apple Level 1 Level 1 (0 points)

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)