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Do hard drives fail from open covers?

R

Rich Grise

Jan 1, 1970
0
[email protected] (Michael Black) wrote:

...
more the platters.

That might be interesting trivia if it were true.

http://westerndigital.com/en/products/Products.asp?DriveID=85

Click on the Configuration tab for each of the sizes and look at a
number of platters.

If you can find data for a series which supports your contention,
please post the link.

You mean you've never seen a Control Data Fixed Module Drive?
Two Spindles, each supporting a pack of ten, 14" aluminum disks,
total capacity, 300 MegaBytes per pack.

Cheers!
Rich
 
R

Rich Grise

Jan 1, 1970
0
Are you suggesting that the typical number of platters is
decreasing? I cannot imagine why.

Then your brain is broken. If you can provide storage to your
customers at, say, $.10 per megabyte, doesn't it stand to reason
that if you could provide those megabytes on _one_ platter, that
the machinery would be cheaper than using _two_ platters for
the same data per drive?

Thanks,
Rich
 
R

Rich Grise

Jan 1, 1970
0
Does anyone have that diagram DEC used to include with
disk drive user/service info? You know the one - it
shows the heads flying over the surface of the disk
next to a particle of dust and cigarette smoke, which
looked like boulders in comparison.

Unfortunately, I neglected to collect one of those diagrams
when I worked at CDC MPI. But, yeah, the heads flew at
50 microinches - they tested their flying height by looking
at the interference fringes with a monochromatic lamp and
glass disk.

And they had, "flying height, smoke particle, dust particle,
human hair" and, yes, a human hair is about 3000 microinches.
And that was in the days where the flying height was
10 or 100 times greater than it is today!

Well, Ida know. It was 0.000050 back then - what are they
flying them at these days? I thought that was the thickness
of the boundary layer!

Thanks,
Rich
 
R

Rich Grise

Jan 1, 1970
0
See item #38 at:
http://www.LearnByDestroying.com/nooze/support.txt
The hard drives have gotten swifter since 1993. I'm not so sure about
the users.

My favorite tech support call wasn't computerz, but it waz electronicz. ;-)

I was a video game repair tech. (also jukeboxes, pinball machines, pool
tables, Foosball tables, Wak-A-Mole machines, etc, etc, etc...) And I did
phone support when a guy has a game in his own shop, but doesn't have a
tech.
[C == customer, M == me]
C: Uh, hi. The machine don't power up.
M: OK. Is it plugged in?
C: Yup.
M: Did you check the fuse?
C: Yup.
M: Do you have volts at the fuse?
C: Uh, no.
M: Do you have volts at the power switch?
C: Uh, lemme go check that...
[background - sound of game powering up and self-testing]
C: Guh-Hyuk! Uh fiyuxed it! An' Uh ain't even a-gonna tell ya
whut uh diyud!
 
R

Rich The Newsgroup Wacko

Jan 1, 1970
0
Do bears shit in the woods

Of course, but do they really wipe their ass with squirrels?
--
Cheers!
Rich
------
"An angst-ridden amorist, Fred,
Saw sartorial changes ahead.
His mind kept on ringing
With fishy girls singing;
Soft fruit also filled him with dread."
-- J. Walker, "The Love Song Of J. Alfred Prufrock"
 
R

Rich The Newsgroup Wacko

Jan 1, 1970
0
Anything else is just another form of Russian Roulette, with one empty
chamber.

Dewd! Did you see that movie too?

"Five!"
"oeryhtuopve?"
"Five!!!!!"
"oiutnubnio!!!!"
"*POW* *POW* *POW* *POW* *POW*"
 
T

Travis Jordan

Jan 1, 1970
0
Rich said:
You mean you've never seen a Control Data Fixed Module Drive?
Two Spindles, each supporting a pack of ten, 14" aluminum disks,
total capacity, 300 MegaBytes per pack.

I don't recall the cost of the packs, but the drives were about $45K in
1987 dollars.
 
Rich said:
Well, Ida know. It was 0.000050 back then - what are they
flying them at these days? I thought that was the thickness
of the boundary layer!

The nominal mechanical spacing in advanced, experimental heads is less
than 10 nanometers, or less than 0.4 microinches. I don't know the
exact values, but current commercial products use spacings smaller than
1 microinch. At those dimensions and the typical linear velocities of
30 m/s (about 60 mph), the air no longer acts as a Newtonian fluid.
They claim that the head and disk surfaces are smooth enough that the
10nm value is a meaninful number, and measurements are often presented
with 1 angstrom resolution..
 
J

Jim Adney

Jan 1, 1970
0
Dewd! Did you see that movie too?

"Five!"
"oeryhtuopve?"
"Five!!!!!"
"oiutnubnio!!!!"
"*POW* *POW* *POW* *POW* *POW*"

Uhhh, no. I was just trying to make up something to illustrate a
point.

What movie?

-
 
R

Rich Grise

Jan 1, 1970
0
Uhhh, no. I was just trying to make up something to illustrate a
point.

What movie?

"The Deer Hunter". Very very weird movie about the craziness in
Veitnam at the time. Christopher Walken had gone AWOL, and was
working in some town playing Russain Roulette for the entertainment
of the Vietnamese folks. They'd place bets on whether he was going
to blow his brains out.

Well, it was getting frenetic - he was doing like two chambered
rounds, and the odds went way up. Then he did three, and the odds
skyrocketed. Then, in all of the excitement, he goes, "Five! How
about five!" And the locals say something incomprehensible, but
they're obviously all excited - he puts five bullets in the gun,
and realizes that there are five "captors", so: *POW* *POW* *POW*
*POW* *POW* he dusts the five guys and escapes.

Cheers!
Rich
 
K

kinyo

Jan 1, 1970
0
I remember working with this type of drives 2 decades ago. We fondly
call them washing machines, can't remember the oem but they are called
Zebra. They are fun to work with at the same time p.i.t.a., but they
taught me all I need to know about hard disks. Being unsealed type, it
was possible to replace individual heads and that's where the fun
begins!
 
T

Tom MacIntyre

Jan 1, 1970
0
"The Deer Hunter". Very very weird movie about the craziness in
Veitnam at the time. Christopher Walken had gone AWOL, and was
working in some town playing Russain Roulette for the entertainment
of the Vietnamese folks. They'd place bets on whether he was going
to blow his brains out.

Well, it was getting frenetic - he was doing like two chambered
rounds, and the odds went way up. Then he did three, and the odds
skyrocketed. Then, in all of the excitement, he goes, "Five! How
about five!" And the locals say something incomprehensible, but
they're obviously all excited - he puts five bullets in the gun,
and realizes that there are five "captors", so: *POW* *POW* *POW*
*POW* *POW* he dusts the five guys and escapes.

So interesting that POW also stands for... :)

Tom
 
S

Sam Goldwasser

Jan 1, 1970
0
kinyo said:
I remember working with this type of drives 2 decades ago. We fondly
call them washing machines, can't remember the oem but they are called
Zebra. They are fun to work with at the same time p.i.t.a., but they
taught me all I need to know about hard disks. Being unsealed type, it
was possible to replace individual heads and that's where the fun
begins!

Yeah, after intalling the $1200 alignment pack after replacing a head
and screeeeeeeeechsssssss&&t. :)

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J

Jim Adney

Jan 1, 1970
0
"The Deer Hunter". Very very weird movie about the craziness in
Veitnam at the time.

Oh, THAT movie. That's one I've always meant to rent and just never
did. Now you've gone and ruined it for me. Drat! ;-)

-
 
B

Blarg

Jan 1, 1970
0
The 5 in the chambers rouletted game did not happen in town. Happened when
DeNiro et al were
prisoners and forced to play at gunpoint under threat of a hideous torture
death.
DeNiro kept upping the number of bullets until he had enough to shoot the
Vietnamese and escape with his buddies.

Walken somehow stays in Vietnam and MUCH later is found playing Russian
roulette for big money in
a Vietnamese city.
 
J

John Doe

Jan 1, 1970
0
Rich said:
Then your brain is broken.
Troll

If you can provide storage to your
customers at, say, $.10 per megabyte, doesn't it stand to reason
that if you could provide those megabytes on _one_ platter, that
the machinery would be cheaper than using _two_ platters for
the same data per drive?

Yes, if the consumer wants half the size.
 
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