I am trying to erase my Macintosh HD but I keep getting a error saying I can't unmount the disk. I am booting up from the install CD so IDK what the problem is
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Can't unmount disk problem?
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Sometimes it indicates that there's some process using the disk...which is odd but happens.
Search for how to use Terminal to force unmount a disk.
Search for how to use Terminal to force unmount a disk.
Exactly what BrianBaughn says : Check if you have a program still accessing it (anything from finder to 3rd party program to Time Machine encrypting your disk etc).
In activity monitor you can force close a program that can't be stopped FYI.
In activity monitor you can force close a program that can't be stopped FYI.