1. Select a drive from the top of the GCC Partitions window.
NOTE: You cannot unmount the startup partition unless you start up from a floppy.
2. Select a partition from the middle of the window.
3. Click the Unmount button. The partition will be unmounted, unless a file on that partition is currently open; in that case, a dialog will be displayed informing you of this. If this dialog does appear, you must Quit from all applications and repeat steps 1 - 3 above in order to unmount this partition.
NOTE: If you are in the Finder, you can unmount a partition by dragging its icon to the Trash.