27 Jun
2014
27 Jun
'14
7:45 a.m.
On 6/26/14 6:49 PM, Mark J. Blair wrote:
It seems to me that by adding a positional transducer
to the head and a suitable servo system, it should thus be possible to position the head
arbitrarily, with resolution limited by the transducer.
If you're going to throw hardware at it, put a DSP in the read channel and positioner
and derive the track position on
the fly based on the recovered data with coarse positioning based on the gross amplitude
of the entire track.
I have actually thought about that for general 14" platter data recovery as opposed
to the open-loop method used to recover
the Cray OS diagnostic pack data.
The method should also work for Apple Widget disk data recovery, where most of the drive
mechanisms have failed
due to the glue failing on the glass graticule used for coarse servo positioning.
But to be honest, I don't see the logic in using an RL02 on an HP-1000 system in the
first place.