Does GetVolumeInformation() returns a unique volume serial number?

Question

The documentation for GetVolumeInformation() says:

This function returns the volume serial number that the operating system assigns when a hard disk is formatted. To programmatically obtain the hard disk's serial number that the manufacturer assigns, use the Windows Management Instrumentation (WMI) Win32_PhysicalMedia property SerialNumber.

Does Windows assigns a unique volume serial number, or could multiple machines have the same volume serial number?

Answer 1

The volume serial number is a DWORD . There are 2 ³² different possible values of a DWORD . Therefore it stands to reason that since there are a finite number of possible values, and an unbounded number of volumes in the world, that there could be multiple volumes sharing the same serial number.