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"You Cannot Install OS X on This Disk. OS X cannot start up from this disk".

Hey, I am running Lion on a Macbook Air 2010 model and i recently bought Mountain Lion through the MAC App Store. ive had problems installing it as i cant install it onto my Macintosh HD (startup Disk). Ive opened the ML installer and its rebooted my mac into the installer Menu, but when it goes to install, it stops and says You Cannot Install OS X on This Disk. OS X cannot start up from this disk." i want to be able to install ML overwriting Lion on my MacintoshHD (startup drive), are there any solutions that can fix this problem?

MacBook Air (13-inch Late 2010), Mac OS X (10.7.4)

Posted on Aug 18, 2012 6:06 AM

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6 replies

Aug 22, 2012 11:45 AM in response to KarmaCop

Glad to hear it!


I ran into another problem: The USB cable I was using for my external backup disk was not reliable. I kept getting "disk ejects" at various points during migration.


I bought a new "2.0 certified" cable and it worked fine. The first two attempts resulted in re-installs.


I'm happy to report that after the 3rd re-install of ML everything appears to be OK.


I disabled TM and keeping my last b/u offline for a few more days to be safe....

"You Cannot Install OS X on This Disk. OS X cannot start up from this disk".

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