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Rabou Author

Level 1

13 points

Volume contains an OS X installation which may be damaged

Got the following message Volume contains an OS X installation which may be damaged. Quit the installer to restart the computer and try again, tried this without results. iMac mid-2008, 4GB Ram, with Mountain Lion 8.5 on internal HD and OS X 10.11 on external drive from which I could start with no problems. Now when OS X 10.11 is selected, computer starts up normally, progress bar reaches approx. 30% and then black screen and computer is off. Tried repairs to no avail. reinstalling OS X from internet would take 25+ hours… When booting from internal drive with MAC OS X 8.5. startup is normal and external drive where OS X 10.11 is located, mounts on desktop with all data visible and accessible. What to do?

Posted on Jan 16, 2016 1:02 PM

16 replies

Eric Root

Level 10

684,603 points

Nov 18, 2017 3:34 PM in response to wayne lic

Did you try erasing/reformatting the drive before installing?

Volume contains an OS X installation which may be damaged

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