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Pcnunes Author

Level 1

4 points

Erase disk

I am trying to erase the disk on my old mac but it says "this operation cannot be performed because you cannot unmount the volume you are booted from". What do I need to do?

Posted on Jun 7, 2021 7:09 AM

Top-ranking reply

Niel

Level 10

732,365 points

Posted on Jun 7, 2021 7:17 AM

Restart with the Command and R keys held down. If the computer's model or firmware is too old for that to be available, insert a Mac OS X install DVD or thumbdrive and restart with C or Option held down.

(199511)

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Erase disk

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