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chscag

 
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Member Since: Jan 23, 2008
Location: Fort Worth, Texas
Posts: 39,072
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You can not erase or format a hard drive while it's mounted. That's like asking your hard drive to commit suicide. Boot the machine with your Leopard or Snow Leopard DVD and use Disk Utility from there. The drive will then erase and reformat. Make sure you have a Time Machine backup to restore from first!

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