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

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)
Solved by Shootist007 on Jul 27, 2012 4:12 AM Solved

I suggest you also make a USB thumb drive of the Lion recovery HD partition using this program.


Lion Recovery Disk Assistant


Before you start fooling around with your drive and also make Time Machine backup of your system so you can restore back to Lion if something get screwed up.

Reply by Shootist007 on Jul 27, 2012 3:51 AM Helpful

Try make more room on the drive then if that doesn't work go into Disk Utility and shrink the drive by a small amount. Drag the partition up from the bottom right hand corner then select Apply. Then try the install.


There is an Apple KB article on this although I don't have a link to it.




Here it is.



Reply by Carolyn Samit on Jul 27, 2012 3:51 AM Helpful

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