If you would like to restore your PC image back to your hard disk after it is formatted, you may run into the problem of not able to run some software due to not able to recognize the old volume serial number.
To get this issue solved, there is one utility, named as Hard Disk Serial Number Changer that can change your volume serial number back to previous serial number.
Hard Disk Serial Number Changer is freeware and handy to use. It can change the volume serial number to what you preferred. Prior to format your hard disk, remember to write down the volume serial number so that you can change the volume serial number back to previous one after it is formatted. If you are not sure where to get the serial number, just go to command prompt, then type dir and press enter, the volume serial number is listed as shown below:
C:\Documents and Settings\Administrator>dir
Volume in drive C is OSDisk
Volume Serial Number is 12AF-AABB
Once you have changed the volume serial number, you must need to reboot your computer in order for the changes to be effective.
Hard Disk Serial Number Changer works perfectly with file systems like NTFS, FAT and FAT32 and is compatible to run in Windows Vista/XP/ME/2000/98/2003/NT. If you plan to format your hard disk but still plan to ensure its software compatibility, this tool is definitely useful and worth getting one.