I cannot repair, partition, or erase any drive: Could Not Unmount Disk error on the computer using Disk Utility. This rebuilds the GUID and EFI so it's for 10.6 version and removes all partitions on the drive, including the hidden RecoveryHD partition. I assume you have used the 10.6 Disk Utiltiy and selected the ENTIRE drive, format Option: MBR and MSDOS, then click Erase and Security Option Zero All Data, and then go back to Partition 1: Option GUID and Format: OS X Extended J? I have zeroed out one hard drive using Disk Utility and I continue to get failed install. I have tried 3 different hard drives that have all been used in this MacBook Pro and all installed with Mountain Lion.
Hold the option/alt key at boot gives Startup Manager, which you then can select a new/other OS to boot from and set it as the startup disk in System Preferences.
The computer stopped responding and after a restart I got a gray screen with a folder and ?.Īll that says is the firmware can't find the bootable OS it was assigned to.
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