NAME
   TD_GETGEOMETRY -- return the geometry of the drive.

FUNCTION
    This command returns a full set of information about the
    layout of the drive. The information is returned in the
    DriveGeometry structure pointed to by io_Data.

IO REQUEST INPUT
    io_Device       preset by the call to OpenDevice()
    io_Unit         preset by the call to OpenDevice()
    io_Command      TD_GETGEOMETRY
    io_Flags        0 or IOF_QUICK
    io_Data         Pointer to a DriveGeometry structure
    io_Length       sizeof(struct DriveGeometry)

IO REQUEST RESULT
    io_Error - 0 for success, or an error code as defined in
               <devices/trackdisk.h>

NOTE
    This information may change when a disk in inserted when
    certain hardware is present.

SEE ALSO
    TD_GETDRIVETYPE, TD_GETNUMTRACKS