This sample program shows how to retrieve the disk volume serial number implemented in disk formats from MS-DOS version 4.x to date. The serial number information resides in the boot sector of the disk at offset 27H to 2AH and is retrieved using DOS Int 25H: Absolute Disk Read. Because VB cannot call DOS Interrupts, MicroHelp MUSCLE is required. The MUSCLE routine "MhDiskReadAbsolute" provides the required functionality.
