"This disk cannot be used to start up your computer."

Discussion in 'Mac OS X Lion (10.7)' started by thompson11, Jul 20, 2011.

  1. thompson11 macrumors member

    Oct 12, 2009
    I beg to differ, Lion installer — seeing as I'm currently booted on that disk.

    Any ideas? I've tried using Repair Disk from Disk Utility, still the same result.

    Several months ago I used Paragon's CampTune to resize my Bootcamp partition. I have a nasty feeling that the program fracked up my boot sector.

  2. ThoseGrapefruit macrumors newbie

    Jul 20, 2011
    Exact same thing happened to me, however I never used CampTune. I have a BOOTCAMP partition and it gave me the same message for Macintosh HD. I believe it has something to do with the swap partition; I think that Lion wants extra space for this swap, or perhaps the built-in recovery disk as well. My solution was to go into Disk Utility, reduce the size of the Macintosh HD by about 10-15 gb and clicking "Apply". If this doesn't work for you, try some of the other things that people have done: https://discussions.apple.com/thread/3189387

    Hope I could be some help! :)
  3. thompson11 thread starter macrumors member

    Oct 12, 2009
    I deduced the same problem/solution and managed to get OS X installed just a little while before your post.

    For those searching, I ended up just shrinking the Macintosh HD partition by 1gb and that was enough to solve this issue. I saw somewhere that the Recovery partition was about 600-700mb, so I think around a gigabyte should be perfect.

    Glad you were able to get it fixed too!
  4. MobiusStrip macrumors regular

    Dec 11, 2009
    Disk Utility’s Partition button is greyed out for my sole internal drive, which I just formatted as HFS+ with Disk Utility. First Aid reports no problems.
  5. MobiusStrip macrumors regular

    Dec 11, 2009
    UPDATE: From the command line, I was able to force Disk Utility to create a partition on the SSD. After then "erasing" that partition in Disk Utility's GUI, I was able to install the OS.

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