NAME
    TD_GETDRIVETYPE -- return the type of disk drive for the unit that was
                       opened.

FUNCTION
    This command returns the type of the disk drive to the user.
    This number will be a small integer and will come from the set of
    DRIVEXXX constants defined in <devices/trackdisk.h>.

    The only way you can actually use this command is if the trackdisk
    device understands the drive type of the hardware that is plugged in.
    This is because the OpenDevice() call will fail if the trackdisk device
    does not understand the drive type. To find raw drive identifiers see
    the disk.resource's DR_GETUNITID entry point.

IO REQUEST INPUT
    io_Device       preset by the call to OpenDevice()
    io_Unit         preset by the call to OpenDevice()
    io_Command      TD_GETDRIVETYPE
    io_Flags        0 or IOF_QUICK

IO REQUEST RESULT
    io_Error - 0 for success, or an error code as defined in
               <devices/trackdisk.h>
    io_Actual - if io_Error is 0 this contains the drive type connected to
                this unit.

SEE ALSO
    TD_GETNUMTRACKS, <devices/trackdisk.h>

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