DRVSPACE /UNMOUNT 
Breaks the connection between the selected drive's compressed volume file
and its drive letter. Unmounting a drive makes it temporarily unavailable.  
You cannot unmount drive C.
Syntax
    DRVSPACE /UNMOUNT [drive:]
Parameter
drive:
    Specifies the drive you want to unmount. This parameter is optional; if
    you omit it, DriveSpace unmounts the current drive.
Switch
/UNMOUNT
    Unmounts the specified compressed drive.
 
 DRVSPACE /UNMOUNT -- Example 
To unmount compressed drive E, type the following command:
    drvspace /unmount e:
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