Change serial number is an operation which is seldom performed but rather vital for advanced users to realize particular purpose. Partition Serial Number is a serial number assigned by the Operating System to a disk partition. The format of partition serial number is: XXXX-XXXX (X could be A, B, C, D, E, F, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9). This disk serial number is automatically generated and assigned when you format a disk partition and there is no documented way to change it without reformatting the disk volume. Partition Assistant allows you to modify the serial number for you disk volume without reformatting hard drive.