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Mac Forum / Applications / Mac Applications / March 2008about harddisk
tell me about hard disk of computers In article <f8ad6688-a3a7-48bb-bec6-c8f977c215b4@e23g2000prf.googlegroups.com>, > tell me about hard disk of computers They spin really fast.  SignatureDeeDee, don't press that button! DeeDee! NO! Dee... > In article > <f8ad6688-a3a7-48bb-bec6-c8f977c215b4@e23g2000prf.googlegroups.com>, > > > tell me about hard disk of computers > > They spin really fast. And they're really hard. SignatureTom Stiller PGP fingerprint = 5108 DDB2 9761 EDE5 E7E3 7BDA 71ED 6496 99C0 C7CF > > In article > > <f8ad6688-a3a7-48bb-bec6-c8f977c215b4@e23g2000prf.googlegroups.com>, [quoted text clipped - 4 lines] > > And they're really hard. And they're discs. (probably about the only technical question I can answer with any confidence-g) >> > > tell me about hard disk of computers >> > [quoted text clipped - 4 lines] > And they're discs. (probably about the only technical question I >can answer with any confidence-g) RAM disks are hard but aren't disks. Nor discs. > >> > > tell me about hard disk of computers > >> > [quoted text clipped - 8 lines] > > Nor discs. Well so much for only question I can answer. sigh In article <tomstiller-2DEE00.07375511032008@newsgroups.comcast.net>, > > In article > > <f8ad6688-a3a7-48bb-bec6-c8f977c215b4@e23g2000prf.googlegroups.com>, [quoted text clipped - 4 lines] > > And they're really hard. And they sleep a lot. Signaturedorayme > And they sleep a lot. Mine's a Pinkerton. It never sleeps. Signature:) JR In article <jim.redelfs-E8D739.19214411032008@news.lga.highwinds-media.com>, > > And they sleep a lot. > > Mine's a Pinkerton. It never sleeps. I have a friend who has had some HDs spinning for more than 3 years. And, btw, I have personally conducted measurement tests on image files that have been spun at high speed for different amounts of time and have found that they do very very slightly change their sizes. I have forwarded my results to the folk at CERN for comment. I cannot publish them here in case it is useful to the Russians. Signaturedorayme In <doraymeRidThis-134B86.11503012032008@news-vip.optusnet.com.au>, dorayme...: > I have a friend who has had some HDs spinning for more than 3 > years. [quoted text clipped - 3 lines] > time and have found that they do very very slightly change their > sizes. Ah, centrifugal image file compression. Is that lossy or lossless? -j SignatureJeffrey Goldberg http://www.goldmark.org/jeff/ I rarely read top-posted, over-quoting or HTML postings. http://improve-usenet.org/ In article <alpine.OSX.1.00.0803112029180.12273@hagrid.ewd.goldmark.org>, > > I have a friend who has had some HDs spinning for more than 3 > > years. [quoted text clipped - 7 lines] > > -j Depends on the speed. When I spin the special disks I use for the tests at positive revolutions per sec, the files grow in size and are lossy. When I spin at negative revolutions per sec, the files get smaller but are lossless. The sense of lossless here, of course, is that one can then subject the shrunken files to a positive speed and the files bounce back to their former size without loss of quality. But it is quite complicated. At negative speeds, the files increase their quality and this is the reason why they appear not reduced in quality from how they were at normal baseline quality when speeded and grown. They lose the quality they gained. All this is is further complicated by the direction of spin. But I better not go on with this because I think Clever Monkey right be watching me (he watches signs of prolixity on my part closely... and I am grateful to him. I always increase my medication when he points prolixity out) Signaturedorayme > But it is quite complicated. At negative speeds, the files > increase their quality and this is the reason why they appear not > reduced in quality from how they were at normal baseline quality > when speeded and grown. They lose the quality they gained. > > All this is is further complicated by the direction of spin. Are you in the northern or southern hemisphere? Have you done your tests in the other? SignatureK. Lang may your lum reek. > > But it is quite complicated. At negative speeds, the files > > increase their quality and this is the reason why they appear not [quoted text clipped - 5 lines] > Are you in the northern or southern hemisphere? Have you done your > tests in the other? O yes, I simulate the northern hemisphere in a specially adapted bath. And yes, I know that plughole drainage directions do not depend on hemisphere. It just so happens that the bath is a special one in a way too complex to describe here (and dangerous to do so in case the Russians get my design). And yes, it does so happen that at least in my bath, when it is switched to "Northern Mode" the water does go down and out in a direction different to when it is switched to Southern Mode. This is not quite a coincidence but it has nothing much to do with serious results I have obtained on effects on files. Signaturedorayme In article <doraymeRidThis-BB2CFE.12573112032008@news-vip.optusnet.com.au>, > In article > <alpine.OSX.1.00.0803112029180.12273@hagrid.ewd.goldmark.org>, [quoted text clipped - 29 lines] > closely... and I am grateful to him. I always increase my > medication when he points prolixity out) In this case, you should have quit while you were ahead. Spin is a vector quantity and a negative spin *is* a reversal of direction. SignatureTom Stiller PGP fingerprint = 5108 DDB2 9761 EDE5 E7E3 7BDA 71ED 6496 99C0 C7CF >> All this is is further complicated by the direction of spin. But >> I better not go on with this because I think Clever Monkey right [quoted text clipped - 4 lines] >In this case, you should have quit while you were ahead. Spin is a >vector quantity and a negative spin *is* a reversal of direction. With this strange but charming discussion, I will note that bosons have twice the spin as fermions. In article <tomstiller-0202EB.10530212032008@newsgroups.comcast.net>, > In article > <doraymeRidThis-BB2CFE.12573112032008@news-vip.optusnet.com.au>, ... > > All this is is further complicated by the direction of spin. But > > I better not go on with this because I think Clever Monkey right [quoted text clipped - 4 lines] > In this case, you should have quit while you were ahead. Spin is a > vector quantity and a negative spin *is* a reversal of direction. I am well aware of this. You do not realise the difficulty I was in in describing my experiments. The contrast mentioned above was not between directions of spin. It was between spin and negative spin. Negative spin, you obviously missed this point, is a state on the other side of sleep. Let me make it plain: (1) Active with movement, spinning at n revs per sec where n > 0 (2) Inactive with n = 0 and (3) Active with negative movement where n < 0 It should be obvious to you because of the difficulty of the Russians getting hold of my data, that I cannot go into the third state in detail but I have proof of it. There is nothing vector about the speeds. They go as fast on either side of rest. But the sides of rest are not the normal directions of spin you (and the Russians) are accustomed to. I hope this clears up the misunderstanding. What's my score now, Tom? Signaturedorayme In article <doraymeRidThis-C81A73.08575513032008@news-vip.optusnet.com.au>, > In article > <tomstiller-0202EB.10530212032008@newsgroups.comcast.net>, [quoted text clipped - 36 lines] > > I hope this clears up the misunderstanding. That depends on what your definition of "negative" is. ;-) > What's my score now, Tom? Off-hand, I'd say ornage. SignatureTom Stiller PGP fingerprint = 5108 DDB2 9761 EDE5 E7E3 7BDA 71ED 6496 99C0 C7CF In article <alpine.OSX.1.00.0803112029180.12273@hagrid.ewd.goldmark.org>, > > I have a friend who has had some HDs spinning for more than 3 > > years. [quoted text clipped - 5 lines] > > Ah, centrifugal image file compression. Don't you mean "expansion"? SignatureNote: Please send all responses to the relevant news group. E-mail sent to this address may be devoured by my very hungry SPAM filter. JR In article <jollyroger-79C07F.21511711032008@earthlink.vsrv-sjc.supernews.net>, > In article > <alpine.OSX.1.00.0803112029180.12273@hagrid.ewd.goldmark.org>, [quoted text clipped - 10 lines] > > Don't you mean "expansion"? Naw, the newer drives have a ridge around the periphery and when the speed exceeds a critical value, the bits pile up against it and are compressed to a fraction of their original size. SignatureTom Stiller PGP fingerprint = 5108 DDB2 9761 EDE5 E7E3 7BDA 71ED 6496 99C0 C7CF > In article > <jollyroger-79C07F.21511711032008@earthlink.vsrv-sjc.supernews.net>, [quoted text clipped - 17 lines] > speed exceeds a critical value, the bits pile up against it and are > compressed to a fraction of their original size. Ohhhhhhhhh so is *that* how they do perpendicular recording?!?: <http://www.hitachigst.com/hdd/research/recording_head/pr/PerpendicularAn imation.html> SignatureNote: Please send all responses to the relevant news group. E-mail sent to this address may be devoured by my very hungry SPAM filter. JR In article <doraymeRidThis-134B86.11503012032008@news-vip.optusnet.com.au>, > And, btw, I have personally conducted measurement tests on image > files that have been spun at high speed for different amounts of > time and have found that they do very very slightly change their > sizes. I have forwarded my results to the folk at CERN for > comment. I cannot publish them here in case it is useful to the > Russians. It's because eventually the bits fly off. They can't hold on forever. Sooner or later they lose their grip. SignatureTom "Tom" Harrington Independent Mac OS X developer since 2002 http://www.atomicbird.com/ > It's because eventually the bits fly off. They can't hold on forever. > Sooner or later they lose their grip. That's only true of the budget-priced bits, not the expensive ones, so if this is important to you, don't buy any two-bit bits. Signature<http://designsbymike.net/shop/mac.cgi> Mac and geek T-shirts & gifts <http://designsbymike.net/election.shtml> Election 2008 goods. <http://designsbymike.net/shop/prius.cgi> Prius shirts/bumper stickers <http://designsbymike.net/shop/greet.cgi> Holiday cards with attitude >> It's because eventually the bits fly off. They can't hold on forever. >> Sooner or later they lose their grip. > > That's only true of the budget-priced bits, not the expensive ones, so > if this is important to you, don't buy any two-bit bits. That's why it's important to use bits made with gluons. It's what disks crave. -j SignatureJeffrey Goldberg http://www.goldmark.org/jeff/ I rarely read top-posted, over-quoting or HTML postings. http://improve-usenet.org/ In article <alpine.OSX.1.00.0803121132040.1044@hagrid.ewd.goldmark.org>, > >> It's because eventually the bits fly off. They can't hold on forever. > >> Sooner or later they lose their grip. [quoted text clipped - 4 lines] > That's why it's important to use bits made with gluons. It's what disks > crave. If you really know what you're doing, you can pop open the hard drive, scrape the bits off the inside of the case, and put them back on the disk. It's a delicate operation though, and it's easy to get bits in the wrong order if you're not careful. SignatureTom "Tom" Harrington Independent Mac OS X developer since 2002 http://www.atomicbird.com/ > In article > <alpine.OSX.1.00.0803121132040.1044@hagrid.ewd.goldmark.org>, [quoted text clipped - 12 lines] > disk. It's a delicate operation though, and it's easy to get bits in > the wrong order if you're not careful. The trouble with that method, of course, is managing the high bits. They just want to hang out behind the spindle and eat twinkies. SignatureBart: This is the worst day of my life. Homer: This is the worst day of your life SO FAR. > > If you really know what you're doing, you can pop open the hard drive, > > scrape the bits off the inside of the case, and put them back on the [quoted text clipped - 3 lines] > The trouble with that method, of course, is managing the high bits. > They just want to hang out behind the spindle and eat twinkies. I have found that you can hide the twinkies by physically forcing them into a block that you know is unreadable and that has been mapped to be avoided by the OS. The high bits know they are on the disk, they can smell them, they go seeking but they cannot find. They are easily manipulated then. Signaturedorayme >> Mine's a Pinkerton. It never sleeps. > >I have a friend who has had some HDs spinning for more than 3 >years. I just started using Time Machine and noticed that every hour during the night it creates new file structures on my back-up drive. I suppose that means I should make my computer sleep when I go to bed. I see the drive starting up when the finder checks it as well as on the hour. > >> In article [quoted text clipped - 9 lines] > > Dvd's are hard and spin quite fast ;-) The discs on my car are hard and spin fast when driving - damn - different spelling SignatureClive Life is not measured by the number of breaths we take..... but by the moments that take our breath away. > > > >> In article [quoted text clipped - 13 lines] > The discs on my car are hard and spin fast when driving - damn - > different spelling Fear not. UNIVAC used to spell them Disc, it is just that they didn't hold all that much storage, were 36 bit 1's complement words, and are no longer manufactured :-) >>>> In article >>>> <f8ad6688-a3a7-48bb-bec6-c8f977c215b4@e23g2000prf.googlegroups.com>, [quoted text clipped - 13 lines] > didn't hold all that much storage, were 36 bit 1's complement > words, and are no longer manufactured :-) This whole thread really should have been crossposted to alt.folkore.computers but then it would have run on for 4 or 5 hundred posts Hell, I just might go back to the OP and crosspost a response anyway. SignatureJohn Varela Trade NEW lamps for OLD for email. > > In article > > <f8ad6688-a3a7-48bb-bec6-c8f977c215b4@e23g2000prf.googlegroups.com>, [quoted text clipped - 4 lines] > > And they're really hard. And a hard disk contains one or more discs. SignatureBart: This is the worst day of my life. Homer: This is the worst day of your life SO FAR. > > In article > > <f8ad6688-a3a7-48bb-bec6-c8f977c215b4@e23g2000prf.googlegroups.com>, [quoted text clipped - 4 lines] > > And they're really hard. And they're flat and round, somewhat disc-like. SignatureBarry Margolin, barmar@alum.mit.edu Arlington, MA *** PLEASE don't copy me on replies, I'll read them in the group *** > > > In article > > > <f8ad6688-a3a7-48bb-bec6-c8f977c215b4@e23g2000prf.googlegroups.com>, [quoted text clipped - 6 lines] > > And they're flat and round, somewhat disc-like. They are also often found in computers. SignatureRichard Maine | Good judgement comes from experience; email: last name at domain . net | experience comes from bad judgement. domain: summertriangle | -- Mark Twain In <vilain-840B89.02583711032008@comcast.dca.giganews.com>, Michael Vilain...: > In article > <f8ad6688-a3a7-48bb-bec6-c8f977c215b4@e23g2000prf.googlegroups.com>, > >> tell me about hard disk of computers > > They spin really fast. On a clear disk you can seek forever. -j SignatureJeffrey Goldberg http://www.goldmark.org/jeff/ I rarely read top-posted, over-quoting or HTML postings. http://improve-usenet.org/ In article <alpine.OSX.1.00.0803111405260.3552@hagrid.ewd.goldmark.org>, > In <vilain-840B89.02583711032008@comcast.dca.giganews.com>, Michael Vilain...: > [quoted text clipped - 6 lines] > > On a clear disk you can seek forever. I wish I'd said that. But not to worry, I will! SignatureBart: This is the worst day of my life. Homer: This is the worst day of your life SO FAR. >> On a clear disk you can seek forever. > > I wish I'd said that. > > But not to worry, I will! I can't take credit for it. I think I saw that in fortune or in some .sig a decades ago. -j SignatureJeffrey Goldberg http://www.goldmark.org/jeff/ I rarely read top-posted, over-quoting or HTML postings. http://improve-usenet.org/ In article <alpine.OSX.1.00.0803111852430.3552@hagrid.ewd.goldmark.org>, Jeffrey Goldberg <nobody@goldmark.org> wrote: > >> On a clear disk you can seek forever. > > [quoted text clipped - 5 lines] > fortune > or in some .sig a decades ago. I believe it was also in the Apple DOS 3.3 manual. SignatureJerry Kindall, Seattle, WA <http://www.jerrykindall.com/> Send only plain text messages under 32K to the Reply-To address. This mailbox is filtered aggressively to thwart spam and viruses. > > I can't take credit for it. I think I saw that in > > fortune > > or in some .sig a decades ago. > > I believe it was also in the Apple DOS 3.3 manual. It goes back even farther than that. I've seen it in the Fortune file on a PDP/11. SignaturePhotography, kink, polyamory, shareware, and more: all at http://www.xeromag.com/franklin.html >>> On a clear disk you can seek forever. >> [quoted text clipped - 5 lines] > fortune >or in some .sig a decades ago. In fact I stole it back when I had a file of .sigs on my Atari 800. |
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