vol in the command prompt shows the "Volume Serial Number".
What actually is that serial number of a partition and what is its use?
Source - Here
I find it helpful for persistence with removable devices in particular.
I have 2 apps that make use of that value.
One is a backup application that uses the serial in the path rather than the mountpoint, which helps keep rotations in line.
Another is a mountpoint reservation app that provides functionality for Windows similarly to that of the UUID syntax in linux's fstab mountpoint configuration.