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how to format external hd after you use it in the time machine ?

L

Luigi Ventura

macrumors newbie
Original poster
Apr 3, 2012
3
0
installed my 500gb external hard drive (model WD External Media 5000BEV) to use it in the time machine on my macbook pro with mac osx system. Now I dont want the time machine anymore, i want to format it to use it at work. and the system complains: Could not unmount the disk . I've tried almost everything, I do not know what else to do. thanks in advance .
 
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