10 Replies Latest reply: Aug 14, 2012 11:21 AM by HELLLOOOOO
Samdeebee Level 1 (0 points)

Just downloaded ML to my mid 2011 MacBook Air and have tried to install it (after backing up my system on Time Machine first, naturally). I accept to the license agreement, and am then asked to choose a disk to install on. However, the installer is not letting me choose Macintosh HD, with the message “The disk cannot be used to start the computer.” Obviously this confuses me, as it’s the original disk, built in (can’t change the disk on airs), and there’s 40GB of free space on there. Tried rebooting but no luck. Any suggestions?

MacBook Air (13-INCH, MID 2011), Mac OS X (10.7.4)