I dont know if this will default to the local recovery partition or force an internet connection, maybe Linc can clarify. To do this, boot your Mac holding down the Command and R keys simultanously. If no external boot drives are available then you can also try Internet recovery which basically loads the recovery partition from Apple's server (slow process). Then from there, run disk utility again and see if it allows you to reformat. See if you can boot from another media like an external hard drive with a system clone or a USB drive with an OS X installer on it. While there is definitely a problem, you could be lucky and just have a case of messed up formatting. Is there any way of saving this drive, or this Mac? Thanks in advance.Īs the recovery partition is in fact part a hidden partition on the hard drive you are trying to reformat, this can sometimes create the behavior you describe. I rebooted the computer back into Recovery Mode, tried again, only for the process to repeat itself (albeit with thick gray vertical bars appearing on the screen, and a square made up of thinner gray horizontal lines appearing next to the mouse cursor, during the initial unmounting process!). The process started, with the diagonally-scrolling progress bar sitting at the "Unmounting disk" status for several minutes, only for an error to pop up reading "Disk Erase failed with the error: Couldn't unmount disk." Any further attempts to erase the drive resulted in the same error popping up instantly. I then opened up Disk Utility once again, selected the hard drive (the main boot partition is greyed out in the side menu), and clicked Erase. I booted from the Recovery Partition once again, and attempted to have the OS X Mountain Lion installer format the hard drive, only for the existing boot partition to not show up in the drive choices menu. After several issues, the hard drive started giving the "Incorrect number of threads" error when Disk Utility's Repair Disk was run from within the Recovery Partition, after which, the computer refused to boot normally, going through a 'status bar' for a long time before shutting itself down.
I'm dealing with a 15" MacBook Pro (April 2010) which seems to be unwilling to reformat its own hard drive.
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