6 Nov
2011
6 Nov
'11
11:53 p.m.
-----Original Message-----
From: cctalk-bounces at classiccmp.org [mailto:cctalk-
bounces at classiccmp.org] On Behalf Of Torfinn Ingolfsen
Sent: 06 November 2011 21:16
To: General Discussion: On-Topic Posts Only
Subject: Re: Micropolis 1355 disk drives
Hi,
On Sun, Nov 6, 2011 at 7:40 PM, allison <ajp166 at verizon.net> wrote:
I just move the head assembly a bit, there is an interlock mechanism that
stops the heads going across the disks, but there is a bit of play in it
usually which should allow you to unstick them. However, that usually is not
enough to cure the problem because the bumpers have turned to sticky goo and
the next time the heads touch the goo they will stick again.
I've done this many times, as in more than 6
and have a stack of them
to be worked on yet.
That sounds good, the "many times" part I mean.
No clean room, however a clean space and no
flying dust. ? ?I just
open them up and apply power and unstick the heads while rotating. I
must be rotating as the heads will slide across the disk in contact.
I've had that happen with no problems I try to avoid that.
How do you unstick the heads? Do you simply poke at them with your finger
or a suitable instrument?
(I tried finding pictures of the insides of a Micropolis 1325, but failed)
>?If that results in the heads doing a servo seek and settling on track
>000 then I needs to deal with the gummy bumper, tweezers and sine
>disterity to grab the bumper and remove it or place a piece of
>adheasive paper on it so when the head retract I do not have to repeat
the
process.
It sounds like placing a piece of adhesive paper on it is the easiest way.
Since I
only want to do this once; can I just any kind of
adhesive paper, or is
there
something I need to watch out for?
I just use a Post-It, really anything will do, you just need to cut a narrow
enough strip to go into the gap where the bumper is. One thing to be aware
of is that the disk can be sensitive to the thickness of the paper. If you
completely remove the goo you need to experiment with multiple layers of
paper until the starting position of the heads is just right, otherwise you
will end up with the same stop-start behaviour.
This assumes the HDA is otherwise ok, and same
for electronics.
The previous owner claims that he had the machine boot from this drive
before, so if nothing bad has happened since then it should still be ok.
When connected to power, the disk spins up, then turns off after a minute so.
google-fu
isn't
I've written this up in comp.os.. (i forget)
and others have as well
over the years.
I tried googling for repair hints, but didn't find it. Perhaps my strong enough.
disk?
This works because the disk spinning has great centrifical force and
anything landing is destined for the perimeter where there is a
circulation filter to pick it up. ?This is why the drive spins up
before loading the heads (also to have the needed airflow for the
heads to fly.).
Cool, I didn't know about the airflow part.
> Also whats the worse that can happen, you kill an otherwise unusable
Agreed.
However, this is the only hard drive in a ND-100/CX machine[1] that I
have,
and I don't have any other ST-506 hard drives.
Supposedly, there is an operating system and an application (simulator /
demo) on the hard drive, so I'm interested in preserving that.
References:
1) http://sites.google.com/site/tingox/nd_3392-1669
--
Regards,
Torfinn Ingolfsen