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#41
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What wears out in an HDD?
Ant wrote
Users learned how to bend things back into place after too many head bangings. Even sillier than you usually manage. Oh, for the good old days ! You're free to use them again any time you like. IIRC, you had to park the drives with software like on 3.5" floppy disk(ette)s if the drives were being moved. Nope, you've mangled that utterly. There was no need to do that with 3.5" floppy drives. I know I did this on my IBM PS/2 model 30 286 10 Mhz desktop PC! You got the story completely scrambled. It was possible to park the heads with the early hard drives that didn’t do anything special when powered down and saw the heads land on the platters when they stopped rotating. |
#42
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What wears out in an HDD?
On 1/17/2016 1:05 AM, Rod Speed wrote:
Users learned how to bend things back into place after too many head bangings. Even sillier than you usually manage. Oh, for the good old days ! You're free to use them again any time you like. IIRC, you had to park the drives with software like on 3.5" floppy disk(ette)s if the drives were being moved. Nope, you've mangled that utterly. There was no need to do that with 3.5" floppy drives. No, I meant parking HDDs with 3.5" bootable floppy disks with their park software. I know I did this on my IBM PS/2 model 30 286 10 Mhz desktop PC! You got the story completely scrambled. It was possible to park the heads with the early hard drives that didn’t do anything special when powered down and saw the heads land on the platters when they stopped rotating. Then, why did IBM say to manually park when moving my IBM PS/2 model 30 286 desktop machine? -- "Don't step on ants... they're people too." --a quote from ANTZ movie. Note: A fixed width font (Courier, Monospace, etc.) is required to see this signature correctly. /\___/\ Ant(Dude) @ http://antfarm.ma.cx (Personal Web Site) / /\ /\ \ Ant's Quality Foraged Links: http://aqfl.net | |o o| | \ _ / If crediting, then use Ant nickname and AQFL URL/link. ( ) Chop ANT from its address if e-mailing privately. Ant is currently not listening to any songs on this computer. |
#43
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What wears out in an HDD?
Ant wrote:
Then, why did IBM say to manually park when moving my IBM PS/2 model 30 286 desktop machine? At one time, heads landed on the platter, with no special provisions. But stiction resulted in the heads sticking to the platter, and suddenly a user would discover the motor could not spin at startup. I think one of my first drives, possibly a Quantum, was supposed to suffer from that. https://en.wikipedia.org/wiki/Stiction (see hard drive section) They put a textured landing zone on the platter, with the idea being that the textured area would prevent the heads from sticking. This would work fine, as long as the OS knows it is supposed to position the heads over that area, before the power goes off. I don't even know if there was a special IDE command for that, an out-of-bounds address, or some other trick to get it there. Later, we got loading ramps. And on looking at this, I jumped to the wrong conclusion. https://www.hgst.com/sites/default/f...aper_FINAL.pdf The "thing" on the very end of the arm, the "pointy part", is the lift tab. The slider is actually underneath the end of the body of the arm, somewhat back from the lift tab. You can see the wires leading up to the slider, to give some idea where it is. https://patents.google.com/patent/US6288876B1/en That particular patent, is about some sort of annealing technique, to make the bottom of the lift tab really smooth, so it doesn't kick up as much crap on every ramp landing. The hard drive specification allows it to go up that ramp 300,000 times. Paul |
#44
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What wears out in an HDD?
In message , Ant
writes: On 1/17/2016 1:05 AM, Rod Speed wrote: [] Nope, you've mangled that utterly. There was no need to do that with 3.5" floppy drives. No, I meant parking HDDs with 3.5" bootable floppy disks with their park software. I don't remember ever coming across _bootable_ park commands; I remember ones that could be copied to the HD itself, and called from DOS. [] It was possible to park the heads with the early hard drives that didn’t do anything special when powered down and saw the heads land on the platters when they stopped rotating. Then, why did IBM say to manually park when moving my IBM PS/2 model 30 286 desktop machine? To move the head into a normally not used part of the disc, so any damage [to the disc] caused by "landing" didn't matter (which according to posts in this thread may have also been textured to reduce stiction). -- J. P. Gilliver. UMRA: 1960/1985 MB++G()AL-IS-Ch++(p)Ar@T+H+Sh0!:`)DNAf After a typical day at the BBC you want something to take your mind off work, although in the end, decent people being eaten alive by heartless monsters running amok proved no distraction. - Eddie Mair, RT 2015/7/4-10 |
#45
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What wears out in an HDD?
On 01/17/2016 06:06 AM, J. P. Gilliver (John) wrote:
[snip] To move the head into a normally not used part of the disc, so any damage [to the disc] caused by "landing" didn't matter (which according to posts in this thread may have also been textured to reduce stiction). IIRC, I had a program called "autopark", which would move the heads to "number of cylinders" after a certain amount of non-use. Since cylinder numbers went from 0 to "number of cylinders"-1, "number of cylinders" itself would be an unused area. -- Mark Lloyd http://notstupid.us/ "And then, one Thursday nearly two thousand years after one man had been nailed to a tree for saying how great it would be to be nice to people for a change..." |
#46
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What wears out in an HDD?
Ant wrote
Rod Speed wrote Users learned how to bend things back into place after too many head bangings. Even sillier than you usually manage. Oh, for the good old days ! You're free to use them again any time you like. IIRC, you had to park the drives with software like on 3.5" floppy disk(ette)s if the drives were being moved. Nope, you've mangled that utterly. There was no need to do that with 3.5" floppy drives. No, I meant parking HDDs with 3.5" bootable floppy disks with their park software. OK, but there was no need to run that from a bootable floppy, you could run it from the hard drive, park the heads, turn the system off. I know I did this on my IBM PS/2 model 30 286 10 Mhz desktop PC! You got the story completely scrambled. It was possible to park the heads with the early hard drives that didn’t do anything special when powered down and saw the heads land on the platters when they stopped rotating. Then, why did IBM say to manually park when moving my IBM PS/2 model 30 286 desktop machine? Because those drives just left the heads where they happened to be when the drive was powered down. |
#47
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What wears out in an HDD?
On Fri, 15 Jan 2016 19:50:41 +1100, "Rod Speed"
wrote: masonc wrote Rod Speed wrote So what clicks when the drive breaks? That's mostly the drive moving the heads to a known spot to recalibrate the position of the head arm. You kids I'm older than you thanks, child. I couldn't believe that I was seeing "Rod Speed" Now I believe. Takes me back to Netcom days. RoDbot --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus |
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