With VolID you can modify your disk drive's serial number which is also called Volume ID (not hard disk's physical serial which you can find at back of your hard disk) , the format of volume ID is: XXXX-XXXX (X maybe 0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F). Close all running program before you modify your volume ID, reboot is required to make the modification take effect. Press "Restore" button you can restore the drive's volume ID to old one. With demo version you can only change the volume ID of drive C: to "1234-5678" .