unmount

This will unmount a drive. This command may be used to unmount a floppy, CDROM, or usb disk. It may also be used to unmount partitions as well.

Example:

umount /media/cdrom

This will unmount the CDROM.

Often new Linux distributions may call your CDROM a CDRECORDER or DVDRECORDER if they can burn CDs or DVDs.

If you needed to unmount a partition it would be the same process. For example if your partition was a backup partition called /bk you could unmount that partition with this command:

umount /bk