Text 14349, 101 rader
Skriven 2006-01-04 07:35:00 av George Vandervort (1:382/8)
  Kommentar till text 14344 av Mike Ross (1:167/133.0)
Ärende: Crash !
===============
Hello Mike!

Tuesday January 03 2006 23:07, MIKE ROSS wrote to George Vandervort:

 MR> "George Vandervort" bravely wrote to "Charles Angelich" (03 Jan 06
 MR> 07:00:00) --- on the heady topic of "Crash !"
 MR>
 GV>> IMHO, Freezing a HD with Stiction would not work well
 GV>> because Freezing the HD would solidify the Lubricant
 GV>> that caused the Stiction problem in the first place.
 MR>
 GV>> I fought Stiction problems also..
 MR>
 GV>> Early SEAGATE HD were manufactured with a
 GV>> poor quality Lubricant that leaked out onto
 GV>> the Platters and Read/Write heads when it
 GV>> heated up, and would Gell when cooled off
 GV>> when the Computer was shut down or went into
 GV>> Hibernation.
 MR>
 GV>> The Gelled Lubricat would Stick the platters
 GV>> together, or even more damaging, the Gelled
 GV>> Lube would Stick the Read/Write Heads to the
 GV>> Platter and Booting the computer or trying to
 GV>> access the HD with Stiction could dammage
 GV>> Some DATA on the Plater where the
 GV>> Read/Write Head was stuck..
 GV>> On some Early HD you had to Park the
 GV>> Read/Write Head before shuting down the computer
 GV>> to keep the Read/Write Head from laying
 GV>> on the Platter over some Data area..
 MR>
 MR>
 MR> Though your theory of the gelled lubricant seems reasonable and
 MR> plausible it is not the only one nor the best explanation of stiction.
 MR> I read it explained that if the head surface became so polished that
 MR> it was perfectly flat with the platter, then when it was parked the
 MR> surfaces actually formed a molecular bond that was stronger than some
 MR> glues. You can observe a similar effect with two pieces of flat glass,
 MR> they are difficult to pull apart without working some air into their
 MR> middle. Freezing helps to reduce the attractive molecular forces
 MR> inbetween the surfaces.

You Theory is also Correct, I've seen proof of both theory's

as far as the Leaking Lube theory, I have Physically
dis-assembled Several Seagte HD that Crashed with Stiction
and were no longer under warranty and all my bag of tricks
including Freezing did not revive them..

The results of my Dis-assembleling the Crashed HD,
one one HD showed that there was evidence of Lube leakage from
the Spindle Hub onto two of the Platters out about
halfway on one plater, and about 3/4 inch on the other
and one Read/Write head had Lube Splattered all over
one side of the read/write head..

ON another HD's the Leakage Only involved one Plater
and the Read/Write head that was gelled to the Platter..

 MR> In addition a hard disk head has some pressure bearing down on it and
 MR> it must take off from the platter in order to function properly. This
 MR> head down force further worsens the stiction problem by forcing the
 MR> molecular effect into more intimate contact and air has great
 MR> difficulty getting inbetween the surfaces. You will notice stiction
 MR> didn't happen with new drives. If the seeping lubricant was at fault
 MR> then new drives would have suffered from stiction too. Stiction only
 MR> came about after a number of head parking cycles had worn the surfaces
 MR> perfectly flat. The cure for stiction is to simply make the head
 MR> surface less than perfectly flat.
 MR>
 MR>  M*i*k*e
 MR>
 MR> ... Now available: "Windows ME ice cubes.": Oh my God! It's frozen!
 MR> -+- Blue Wave/DOS v2.30
 MR>  + Origin: Juxtaposition BBS, Telnet:juxtaposition.dynip.com
 MR> (1:167/133)

Hmmm... Here is another side to the Gravity and centrifical
effect on the Head pressure..

Way back in the early 1980's, there was a School of thouht
that standing or Mounting the Hard drive on edge, intead
on laying Flat amy reduce the Head pressure on the platters.

I notice that one one HD that was Formated Standing on Edge
would not Bootup when Re-Installed laying Flat??
go figure.. But Un-installing it and remounting it on edge,
it Booted up again and ran fine..


Regards,
George Vandervort - NET382 NPC
InterNet EMail: georgev@austin.rr.com
Tech Support: http://home.austin.rr.com/llr/tech.html

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