Compatibility: 4.0+ Expects: AX 440dH BX drive (0=default, 1=A, 2=B, etc.) CL 46H CH 08H (device category: block device) DS:DX addr of an IoctlMediaIdRec containing desired settings ────────────────────────────────────────────────────────────────── Returns: AX error code if CF is set to CY ────────────────────────────────────────────────────────────────── Info: Sets the volume label, serial number, and file system ID for the specified drive. This writes directly to the boot sector of the disk. You may wish to use Fn 440dH 66H (query Media ID) to pre-fill the IoctlMediaIdRec, then just change one or two settings before calling this fn. See Also: Fn 44H (IOCTL) Fn 440dH (generic IOCTL for block devices) Fn 440dH 66H (query media ID) Generic IOCTL Data Packets DOS Functions -♦-