I will now reboot my iMac in Recovery Disk mode and re-install Mavericks on the MacMini. When I then fired up Disk Utility there was my disk - newly erased. In my case it said The Core Storage Logical Volume Group UUID is 48AE3F70-916B-4BEB-AF63-0C2423E1481EĮrror: -69783: Unable to delete the CoreStorage Logical Volume Group On the third ‘bong’ you can let go of the keys. The system will restart with the ‘bong noise allow it to do this 3 times. % diskutil cs delete XXXXXXXXXXXXXXXXXXXXXXXXXXXX <- put the Logical Volume Group ID in place of the Xs Power on the Mac and immediately press and hold command-option-P-R. Its not tIf you see Shut Down, Restart, and Sleep buttons, youre at the login window.If you see a Switch User button, click it to switch to the login window. % diskutil cs list to get the the Logical Volume Group ID The login window appears after you turn on, restart, or log out of your Mac. So, not caring about the data on that MacMini (it's just my TV server, nothing that cant be reinstalled and all the actual data is on an external drive) I've booted it in target disk mode (hold down t when you start it up and connect it via FireWire to another Mac) then fire up your Terminal. The HD in my MacMini has become corrupted and my only option is to erase it, but, in a fit of security consciousness, I encrypted it with FileVault and so Disk Utility won't erase it at all.
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