If the the above measure fails and the Disk utility couldn't resolve the issue, then you are left with one choice to reinstall the operating system with the option Archive & Install.ģ. The procedure changes certain system preferences like system volume, mouse speed settings etc.Ģ.
Try resetting the nvram and reselect the startup volume. Moreover, a system or application crash can sometimes corrupt the nvram or affect the journal or directory entries of the file system.ġ. It can be a bad RAM, bad sectors on the hard drive etc. “The volume 'Macintosh HD' needs to be repairedĮrror:filesystem verify or repair failed”īefore cursing negligence and any such things, you must admit that there can be a number of reasons behind the issue, that you can count.
The disk 'Macintosh HD' could not be unmounted” To your dismay, in the above situation, if you try to reboot your Mac system from the installation disk and try 'First Aid' from the Disk Utility in order to verify and repair, you may find the following errors subsequently: All your data lies inside the Mac hard drive and the problem occurred so suddenly that you are quite clueless about the issue and have to think for some Mac recovery utility to recover back the data. You plugged out the peripherals, such as external sound cards, printer, external modem etc and rebooted the system to find the flashing question mark again. You rebooted the system and found the blank grey screen with a flashing question mark. Thereafter, the colored wheel appeared on the screen and the system almost hangs out there unusually for several minutes. While using the Logic studio on your Mac OS X, there occurred an error and the Logic studio application crashed.
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