It’s stored in the disk parameter block part of thevolume boot record.
assigned by the manufacturer.
How Is the Volume Serial Number Generated?
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This means it will change each time the drive is formatted.
Execute it without any options, and you’ll see both thevolume serial numberand thevolume label.
While this is technically possible, the chance is infinitesimally small and isn’t usually a concern.
Are Duplicate Volume Serial Numbers a Problem?
No, they’re not a problem for Windows or other operating systems.
Windows will not be confused as to which drive is which if two drives share volume serial numbers.