9 Replies Latest reply: Sep 25, 2013 11:03 AM by Rich.IT
Rich.IT Level 1 Level 1 (0 points)

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)