The KRyLack Volume Serial Number Editor application was designed to help modify your disk drive's Volume Serial Number (not hard disk's physical serial which you can find at back of your hard disk), the format of Volume Serial Number is: XXXX-XXXX (X maybe 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F).Limitations: