440Dh                   ■ Generic IOCTL for Block Devices

    Int 21h, function 440Dh subfunctions:

        Minor code      Subfunction
            40h         Set Device Parameters
            41h         Write Track on Logical Device
            42h         Format Track on Logical Device
            46h         Set Media ID
            60h         Get Device Parameters
            61h         Read Track on Logical Device
            62h         Verify Track on Logical Device
            66h         Get Media ID
            68h         Sense Media Type