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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