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Trying to wipe HD...says cant unmount disk?

yanksrock100

yanksrock100

macrumors 6502a
Original poster
Oct 30, 2010
673
245
San Diego
Im going to wipe my HD, and did command+r. It booted into recovery, and I went to disk utility. I went to my HD (hitachi name, 160.04 gb), and pressed erase.
Then a message popped up saying "cant unmount disk"

Help? What can I do?

I sold my Macbook and need to wipe it!

Thanks
 
Boot from a USB stick or a CD/DVD (ideally an OS X installation medium, as it includes Disk Utility you're probably familiar with), you'll be able to format the whole HD then.
 
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