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Installation Mountain Lion

262 Views 9 Replies Latest reply: Sep 25, 2013 11:03 AM by Rich.IT RSS
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Sep 25, 2013 7:06 AM

After downloading Mountain Lion I can't install it as I get "the disk is being used for the backup of Time machine" (translation from Italian) can anybody help me? Thanks.

iMac (21.5-inch Mid 2011), Mac OS X (10.6.8)

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