In a similar manner, I think that if a drive can be
slightly modified so
that the hub clamp has a slight eccentricity (with respect to the
spindle), a pattern would result upon writing that centered around the
Sure, that;s essentaily the pattern on n analogue alignment disk.
I think machining the drive hub to give the rigth degree of sccentricity
would be non-trivial.
I did wonder if you could modify the positioner circuitry. Most floppy
drives use stepper motors, and as is well-know, if you feed carefully
controleld currents into the windings you can 'micro step' them, you can
get them to settle between their normal positions. I wonder if you could
feed sutiable signals in to wobble the headjust enoguh (synchronised wit
hthe spindle rotation) to write the eccntric track.
-tony