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 % diskutil cs delete XXXXXXXXXXXXXXXXXXXXXXXXXXXX <- put the Logical Volume Group ID in place of the Xs Hold these buttons until you see the apple logo. Turn on your Mac and instantly press and hold the Option+Command+R buttons on your keyboard. % diskutil cs list to get the the Logical Volume Group ID Follow these steps to run your Mac in recovery mode: 1. 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. Select Set Password next to your user account. On the Password Reset window that shows up, select Forgot all passwords 4. Type the following command into the Terminal window and hit Enter: resetpassword 3. 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. In the macOS Recovery mode screen, select Utilities > Terminal on the menu bar.
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