How do I unmount a drive "not mounted by HAL"?

How do I unmount a drive "not mounted by HAL"? I'm running CentOS in a virtual machine (VMware) and booting from an iso, is it possible to unmount the 'drive' I booted from?
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bert [Entry]

"Not mounted by HAL means you can't unmount it as a normal user so you need to use your root account to do so.

So run:

su
(enter your root password)
umount /mnt/wherever"