20 Oct
2016
20 Oct
'16
9:42 a.m.
I've got several ST251-1s that spin up just fine, no funny noises, but then do a bunch
of back-and-forth seeks and shut down again.
It's the usual, "they worked fine the last time;" any ideas what the problem
is and if there's anything that can be done? Presumably it's having trouble
finding the sync track; weak signal? Any ideas?
m
----- Original Message -----
From: "Al Kossow" <aek at bitsavers.org>
To: <cctalk at classiccmp.org>
Sent: Thursday, October 20, 2016 12:23 PM
Subject: Re: Unsticking a Seagate ST-419 head
The two disks this morning went much better. I tried
using a heat gun on the outside of the hda and VERY
gently freed the heads and got the spindle to turn. Then I pulled the top board and
coaxed the spindle motor
back up to speed. The root disk read without errors, usr has a consistent 28.
The same experiment didn't work on the usr disk from the first system though :-(
At least now I have a good root image and probably usuable usr
On 10/20/16 2:05 AM, jim stephens wrote:
I actually years ago unstuck drives by removing
them, hooking them to cables long enough to allow me to have access to
them external to the system with power, and just holding them in the air and giving them
a sharp twist around the axis
of the drive. That was enough to unstick most.