A volume serial number, sometimes referred to as a VSN, is a unique hexadecimal number assigned to a disk during the creation of the file system during formatting.
How to Change Your Volume Serial Number Using VolumeID by Nicholas Lee Fagan
It is stored in the disk parameter block of the volume boot record.
Microsoft and IBM added the VSN to the formatting process in 1987, when they collaborated on the development of the OS/2 operating system.
It is created from a fairly complex combination of the year, hour, month, second, and hundredths of a second that the drive was formatted. This means that it changes every time the drive is formatted.
