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 If the App Store keeps asking for a password, the problem might be because the application was purchased with an old account. It keeps asking me for my password, although Im very sure Ive entered it correctly. % diskutil cs delete XXXXXXXXXXXXXXXXXXXXXXXXXXXX <- put the Logical Volume Group ID in place of the Xs Ever since I updated my Mac OS a few days ago to Ventura 13.2 (and now to 13.2.1), I cant mount my external WD My Passport 4TB hard disk. % diskutil cs list to get the the Logical Volume Group ID RELATED: How to Reset Your Forgotten Mac OS X Password. Press and hold the Command+R keys as the computer boots and it will boot into recovery mode. You’ll need to restart your Mac by clicking the Apple menu and selecting Restart. If you want to require a password each time the computer goes to sleep, select the Lock when sleeping checkbox. Select the Lock after checkbox, then enter a number of minutes. Choose Edit > Change Settings for Keychain login. 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. Macs also have a built-in password reset tool available in recovery mode. In the Keychain Access app on your Mac, click login in the Keychains list. 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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