See: Fn 440dH 40H (set device parameters) 3.2+ Fn 440dH 41H (write track) 3.2+ Fn 440dH 42H (format and verify track) 3.2+ Fn 440dH 46H (set media ID) 4.0+ Fn 440dH 47H (set disk access flag) 4.0 only Fn 440dH 60H (get device parameters) 3.2+ Fn 440dH 61H (read track) 3.2+ Fn 440dH 62H (verify track) 3.2+ Fn 440dH 66H (query media ID) 4.0+ Fn 440dH 67H (query disk access flag) 4.0 only Fn 440dH 68H (sense media type) 5.0+ Info: These functions require a "minor code" value in the CL register as well as the 440dH in AX. See Also: Fn 44H (IOCTL) Fn 440cH (generic IOCTL for character devices) Generic IOCTL Data Packets Device Drivers DOS Functions -♦-