dave@micropen.UUCP (04/01/87)
I have two systems with Seagate 4051 hard drives. Both drives
have increased noise from within the drive that is not unlike
bearing noise. I took one machine down and took it to my local
clone-home. They took the drive out, cleared the circuit boards,
and removed a fair amount of gunk from the brake. No more noise.
Problem solved, no?! No. The drive hangs in boot. A scan of
the surface (using Ontracks Disk Manager) shows no less than
*65* bad sectors, one of which being my boot track. Basically,
a lot of head's 2 and 3 cylinders are shot. I remember vaguely
people discussing noisy drives and the infamous Seagate brake.
Could someone refresh me?
Also, the disk manager reports some different bad sectors on
subsequent runs. I cannot believe that hard disk errors should
give different results on different trials. (Non-deterministic
computing bothers me--especially when a hard error is defined
by its being deterministic: failure 100% of the time.)
My technoids say do a low-level format. I cannot see how that will
help since PC disks need good boot tracks to work and my boot is
already compromised. My jist is that they must have damaged the
circuit boards on the disk and that the media is fine. (No physical
mistreatment was done and 4051s have autopark.) Anyone care
to confirm, deny, embelish this story of woe?
--
David F. Carlson, Micropen, Inc.
...!{seismo}!rochester!ur-valhalla!micropen!dave
"The faster I go, the behinder I get." --Lewis Carrolldavidsen@steinmetz.UUCP (04/01/87)
In article <168@micropen> dave@micropen (David F. Carlson) writes:
#I have two systems with Seagate 4051 hard drives. Both drives
#have increased noise from within the drive that is not unlike
#bearing noise. I took one machine down and took it to my local
#clone-home. They took the drive out, cleared the circuit boards,
#and removed a fair amount of gunk from the brake. No more noise.
#Problem solved, no?! No. The drive hangs in boot. A scan of
There are two common things which cause this symptom (and a rash of
uncommon). One is that some link from the heads to the source of
mechanical power for the actuator has slop. This calls for a rebuild.
The other is that one hard knock has moved the heads in relation to the
platter. It could have happened during your "brake job". Reformat the
disk... what have you got to lose?
My mailer doesn't like your address.
--
bill davidsen sixhub \
ihnp4!seismo!rochester!steinmetz -> crdos1!davidsen
chinet /
ARPA: davidsen%crdos1.uucp@ge-crd.ARPA (or davidsen@ge-crd.ARPA)