🚀 go-pugleaf

Ok, I've got the book here : It's "PC onderhoud en uitbreiding" from "EC".  It's a
translation from a german book from "Data Becker", but doesn't state the original title.

In chapter 9 - The hard disk : speed ain't no magic word - on paige 472 and 473 it states :


Klemmende koppen

Met name bij oudere schijven, die al lang gebruikt worden, treedt een probleem op.  Door de
centrifugaalkracht wordt de laag op de plaat langzaam naar buiten geslingerd.  De plaat wordt
daardoor aan de rand dikker dan bij het midden.  Helaas wordt de kop hier meestal geplaatst
bij het parkeren en kan deze vast komen te zitten!  U kunt dit herkennen, doordat de
schijfmotor bromt en de plaat probeert op toeren te komen - zonder succes.  Als eerste en
eenmalige oplossing moet u in dit geval de harde schijf demonteren en er zijwaarts een tik op
geven, om de kop los te maken.  Als bij inschakelen de harde schijf wel op toeren komt, maakt
u onmiddellijk een back-up van alle belangrijke bestanden en koopt u direct een nieuwe harde
schijf!


In english this would be:
Jamming heads
Especially with older disks, that are already used over a longer period of time, a problem
occurs.  Because of the centrifugal force the layer on the disk is slowly forced outward.  In
that way the disk becomes thicker by the edges than in the middle.  Unfortunately is this the
place where the head is placed during parking and can get stuck!  You can identify this
problem, because the diskmotor is humming and the disk is trying to spin up - to no avail.
As a first and final solution you have to disassemble the harddisk en give it a tick on it's
side, to free the head.  If the disk spins up when powered on, you instantly make a backup of
all important files and you immediatly buy a new hard disk!



Never the less, I've calculated the speed of the outer tracks of a 10000! rpm disk and it was
so low that I really don't think anymore that this is really possible (also the layer being
only microns thick).  Even more, I've opened up an XT-harddisk of 40MB (bigfoot) and the
heads are parked on the inner tracks.  I will open up another disk and see where this one
parks.  If this one also parks on the inside I will send a mail to the publisher (EC) to ask
where they got their information.

regards
Steven

John Navas wrote:

> [POSTED TO comp.sys.ibm.pc.hardware.storage]
> Wacko-Jacko <steven.vandenbosch@alcatel.be> wrote:
>
> >The book is over at a friends place now.  I will get it during the week-end and include
> >the text both in dutch and in english (about the movement of particles).
>
> I waiting impatiently.  ;-)
>
> >About the
> >magnetism getting lost, I suggest something about (electro)magnetism.  There are quite a
> >few engineers here at alcatel, and those I interviewed just now (it's getting late and
> >most people have gone home) all agree.
>
> Unfortunately, they are badly misinformed.  But then Alcatel is not a disk
> drive manf.  ;-)
>
> >I'll be back...
> >
> >after the week-end
>
> I waiting impatiently.
>
> >John Navas wrote:
> >
> >> [POSTED TO comp.sys.ibm.pc.hardware.storage]
> >> Wacko-Jacko <steven.vandenbosch@alcatel.be> wrote:
> >>
> >> >Guess you didn't know either that you should low level format your harddrive every
> >> >five years because the magnetic information gets lost in time and by just copying,
> >> >you don't take along the formating information.
> >>
> >> With all due respect, that is utter nonsense.
> >>
> >> >Just read up about harddisks, you just might learn something.  I would recommend a
> >> >good one about various hardware but it is in dutch and I don't suppose that is well
> >> >known in Australia.
> >>
> >> I've worked in the hard disk industry on and off for over 20 years.  How
> >> about you?
> >
> >I've worked in the nuclear sector for quite some time, doesn't make me an expert though.
>
> I've testified as an expert in a number disk technology lawsuits.
>
> >> p.s.  If you think you have any sort of proof for your claims, please be
> >> more specific with what we should be reading.
>
> --
> Best regards,
> John  mailto:Usenet@NavasGrp.Dublin.CA.US  http://www.aimnet.com/~jnavas/

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