Cannot repair disk0s2 with mavericks utility disk on a SSD

bootdisk-utilityerrorpartitionssd

I was trying to repair a corrupted partition (OSX Mavericks) the mac doesn't boot anymore (grey apple logo with infinty spinning gear). I've just tried with safe mode, PRAM restor etc… And the recovery HD partition doesn't boot the UD so I had to create a bootable USB mavericks installation and start there the UD.

When i run, from terminal: diskutil repairVolume /dev/disk0s2 it return an error of bad ref of that file system with this code -69846. after that i can't see anymore the disk0 through diskutil list. also, I cannot erase the partition because it appears unmounted (light grey text on the HD list)

I've tried also to start an install of mavericks directly but it doesn't show me the SSD to locate the installation.

What can I do to fix this problem?

Best Answer

If you have booted from other media and tried Apple's tools then the only thing(s) left are 3rd party tools.

My go-to is Diskwarrior and while some drives with a lot of files will cause it to fail (so I have heard) I've, personally, never had an issue with it. It has always worked and almost always fixed the problem.

Failing that TechTool pro and Prosoft Engineering are a couple of other places to look.

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Disk I/O errors literally translate to input / output errors, which occur when the system is unable to communicate properly with the hard drive. This is very indicative of a hardware failure, whether it be with the hard drive itself, the logic board or the SATA data cable that runs between the two. Given the age of your Mac (5~ years) I would assume that the hard drive is to blame. Disk Utility repairs the volume on the disk at a software level, often it will report when hard drives have a hardware failure but there are also times when it repairs correctly despite communication errors still being present.

Apple Hardware Test (AHT) IS pretty good at giving you a solid answer but as you've found out it's no longer on your hard drive, likely lost during an old upgrade or re-install. You should be able to boot to it using the gray restore discs that came with your iMac. Discs from another iMac/Mac will not work unless it's identical to yours, these are very hardware specific. AHT should be on the disc labeled "Applications Install DVD", with a small mention of AHT and its version number. Holding down D while booting with that disc inserted should boot the Mac to AHT.

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Try booting form external disk:

Create it first with your OS X version.

Attach the USB **boot** drive to the Mac and reboot
Hold down the OPTION key during boot, then select the attached boot drive (typically has an orange icon at the boot menu)
At the boot menu, choose “Disk Utility” (if using an Installer disk, pull down the “Utilities” menu to access Disk Utility)
Go to “First Aid” and verify the disk, then repair if needed
--> Now perform the original task that threw the “Couldn’t Unmount” error

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