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Re: Disk Add on



In message Wed, 6 Jul 1994 09:01:27 -0500 (CDT),
  strat@atfs0.dsd.northrop.com (Scott Stratmoen)  writes:

>> Not quite.  The pins on the drive are offset from the pins on the 170MB
>> drive by one.  i.e. the pins are in the same location relative to each
>> other, but the pins on the 340MB drive are shifted about 2mm to the
>> left.  I went ahead and forced the cable that goes from the pins to the
>> hard drive  socket to fit (a little bit of creative folding, but it's
>> still under some  stress) and the drive works fine

> Very strange. Did you remove the jumper on one end of the connector? You
> don't need it. The 340MB is exactly the same form, fit and function as
> the 170MB drive. The cable plugs on without any folding, bending, etc.
> Are you sure that you have the exact drive I purchased?

This *is* strange.  I assume you still have the 170 MB drive lying around.
Could you measure it and compare to mine?  I placed the drive as it sits in
the ThinkPad.  From the center of the screw on the left side to the leftmost
pin it's 8 mm.  From the center of the screw on the right side to the
rightmost pin it's 7.5mm.  As I said, the 340 MB drive had pins shifted
about 2 mm (one pin) to the left.  Yes, I removed the jumped at the right
end.  The model number matched up with the one you gave me.

Maybe it's our 170MB drives that are different.  When did you buy your TP?

> I would like another case and cable assembly, to put the 170MB drive in.
> I don't know how practical it is to swap the drives though. The life of
> the connectors are limited.

Since one of IBM's selling points is that you can use one computer with
multiple drives for several people, I assume this sort of wear and tear is
covered under warranty.

> I assume that you didn't mess up the label over the screws. A floppy
> label's backing makes a great way to preserve the glue surface!

The label is a great way to hold the screws in place.  :)
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