umount [-f] [{-a | DriveLetter:[...] | NetworkMount[...]}]

The umount command-line utility disconnects the specified NFS-mounted drive. You must supply at least one of the following options or arguments.

-f

Forces deletion of Network File System (NFS) network drives.

-a

Deletes all NFS network drives. If there are active connections, umount prompts you for confirmation unless you also use the -f option.

DriveLetter

The letter of the logical drive to be disconnected.

NetworkMount

The network mount point to be disconnected. This mount must have been created using the net use Windows command-line utility without specifying a drive letter.