The discussions of mounting filesystems in the previous sections wouldn't be complete without a parallel discussion of unmounting those filesystems. Unmounting a filesystem removes the association between that filesystem and the directory in which it was mounted. In the case of removable media such as a CD, you will not be able to remove a manually mounted CD from your drive unless it is first unmounted.
Unmounting a filesystem is done using the umount command (note the missing n). You must be the root user or be executing using root privileges to unmount a filesystem. To unmount a filesystem, simply specify the name of the partition, filesystem, or its mount point on the umount command line. For a USB CD drive (/dev/cdrom) that is actually the physical device /dev/sr0 and is mounted at /media/cdrom, the following three commands are equivalent:
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