Disks formatted with Dos 4.0, 5.0 and 6.0 contain a disk serial number
located on the boot sector of the disk. The serial number appears when you
do a directory of the disk, making it a convenient way to display your
product's serial instead.
To replace the serial number with your own you need to specify the disk
address location of the Dos serial number. The serial number occurs at the
location right before the volume label of the disk (cylinder 0, head 0,
sector 1, offset 39, beginning from 0).
To enter this information select Edit|Edit Table|Add from the Serial Choices
menu and enter the disk address(given above). Now go back to the Serial menu
and enter "^^^^" for the Stamp Mask. This will replace the Dos serial number
with a 32-bit number of your own choosing. For more information on
Stamp Mask see Serialization File.