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#21
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On Thu, 25 Sep 2003 17:37:28 +0000 (UTC), Baffie
wrote: On Thu, 25 Sep 2003 17:49:42 +0100, Rob Morley wrote: Baffie wrote: snip It ain't a problem for me as I've got my power settings shutting down the HD after 10 minutes of inactivity, saves power, saves wear and tear and prevents heat/noise. As long as your HD is adequately cooled it's kinder to leave it spinning than to frequently spin it up and down. that was the case in days of old, thermal shock now isn't so much an issue with 21st century bearings and higher density storage. Untrue, and likely fabricated. Higher density storage has the exact opposite effect, makes it even more likely to lose data when there's slight bearing wear. Even so, it'll depend on usage patterns, whether the bearing fails before another problem arises or the drive is retired. Dave |
#22
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kony wrote:
On Thu, 25 Sep 2003 17:37:28 +0000 (UTC), Baffie wrote: [snip] As long as your HD is adequately cooled it's kinder to leave it spinning than to frequently spin it up and down. that was the case in days of old, thermal shock now isn't so much an issue with 21st century bearings and higher density storage. Untrue, and likely fabricated. Higher density storage has the exact opposite effect, makes it even more likely to lose data when there's slight bearing wear. Unless the transition to higher storage densities nesessitated a move from "blind" positioning systems to ones which tracked the data on the disk (in a similar way to CDs). Tim -- And the beast shall be made legion. Its numbers shall be increased a thousand thousand fold. The din of a million keyboards like unto a great storm shall cover the earth, and the followers of Mammon shall tremble. - The Book of Mozilla, 3:31 |
#23
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On Thu, 25 Sep 2003 23:36:50 +0100, Tim Auton
wrote: kony wrote: On Thu, 25 Sep 2003 17:37:28 +0000 (UTC), Baffie wrote: [snip] As long as your HD is adequately cooled it's kinder to leave it spinning than to frequently spin it up and down. that was the case in days of old, thermal shock now isn't so much an issue with 21st century bearings and higher density storage. Untrue, and likely fabricated. Higher density storage has the exact opposite effect, makes it even more likely to lose data when there's slight bearing wear. Unless the transition to higher storage densities nesessitated a move from "blind" positioning systems to ones which tracked the data on the disk (in a similar way to CDs). Any way you want to look at it, there's still the same issue, increased non-repeatable runout will foul head-positioning. There is no "fix" for that. Dave |
#24
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kony wrote:
On Thu, 25 Sep 2003 23:36:50 +0100, Tim Auton wrote: kony wrote: On Thu, 25 Sep 2003 17:37:28 +0000 (UTC), Baffie wrote: [snip] As long as your HD is adequately cooled it's kinder to leave it spinning than to frequently spin it up and down. that was the case in days of old, thermal shock now isn't so much an issue with 21st century bearings and higher density storage. Untrue, and likely fabricated. Higher density storage has the exact opposite effect, makes it even more likely to lose data when there's slight bearing wear. Unless the transition to higher storage densities nesessitated a move from "blind" positioning systems to ones which tracked the data on the disk (in a similar way to CDs). Any way you want to look at it, there's still the same issue, increased non-repeatable runout will foul head-positioning. There is no "fix" for that. No fix? You think a CD head scans x.xxxx mm to the exact part of a track you requested? No, it follows the wobbly tracks on the badly centred CD. Tim -- And the beast shall be made legion. Its numbers shall be increased a thousand thousand fold. The din of a million keyboards like unto a great storm shall cover the earth, and the followers of Mammon shall tremble. - The Book of Mozilla, 3:31 |
#25
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On Fri, 26 Sep 2003 00:26:49 +0100, Tim Auton
wrote: kony wrote: On Thu, 25 Sep 2003 23:36:50 +0100, Tim Auton wrote: kony wrote: On Thu, 25 Sep 2003 17:37:28 +0000 (UTC), Baffie wrote: [snip] As long as your HD is adequately cooled it's kinder to leave it spinning than to frequently spin it up and down. that was the case in days of old, thermal shock now isn't so much an issue with 21st century bearings and higher density storage. Untrue, and likely fabricated. Higher density storage has the exact opposite effect, makes it even more likely to lose data when there's slight bearing wear. Unless the transition to higher storage densities nesessitated a move from "blind" positioning systems to ones which tracked the data on the disk (in a similar way to CDs). Any way you want to look at it, there's still the same issue, increased non-repeatable runout will foul head-positioning. There is no "fix" for that. No fix? You think a CD head scans x.xxxx mm to the exact part of a track you requested? No, it follows the wobbly tracks on the badly centred CD. Tim It can follow because that is _repeatable_ runout. Even so, that is moving the opposite direction, not higher density but lower. Dave |
#27
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"Gary D." wrote: I've tried building fan baffles using various tubing attached to the rear of the PC fan outlet - it can help but after a few hours of use the top of the PC case gets quite warm - I wouldn't want to risk leaving it on all day, overheating and/or fire risk. Have you thought about just building a 4-sided plywood box around it that had cheap carpeting stapled to the inside surfaces? The box could even have a carpeted floor that didn't extend all the way to the rear wall so that cables could still drop down behind the desk. The front and rear walls could be doors that swung open for access to cables (rear) and to drives (front), and the front door would be open at the bottom (à la bar room door) to allow fresh air intake. Essentially, that would be giving up on quiet fans and relying instead on a sound absorbing partial cabinet around the case. The reason that companies haven't offered them is that they are so low tech (and bulky and heavy) that there would be no profit in them. But that makes them perfect for the homebuilder. *TimDaniels* |
#28
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Timothy Daniels wrote: "Gary D." wrote: I've tried building fan baffles using various tubing attached to the rear of the PC fan outlet - it can help but after a few hours of use the top of the PC case gets quite warm - I wouldn't want to risk leaving it on all day, overheating and/or fire risk. Have you thought about just building a 4-sided plywood box around it that had cheap carpeting stapled to the inside surfaces? The box could even have a carpeted floor that didn't extend all the way to the rear wall so that cables could still drop down behind the desk. The front and rear walls could be doors that swung open for access to cables (rear) and to drives (front), and the front door would be open at the bottom (à la bar room door) to allow fresh air intake. Essentially, that would be giving up on quiet fans and relying instead on a sound absorbing partial cabinet around the case. The reason that companies haven't offered them is that they are so low tech (and bulky and heavy) that there would be no profit in them. But that makes them perfect for the homebuilder. A problem though with this solution is that it also keep the heat inside. Sound absorbing material is usually also heat insulating. Secondly, our sound perception follows a logarithmic scale; a small audible reduction of 3 dB require a 50% reduction in sound energy. |
#29
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"Johannes H Andersen" replied: Timothy Daniels wrote: Have you thought about just building a 4-sided plywood box around it that had cheap carpeting stapled to the inside surfaces? The box could even have a carpeted floor that didn't extend all the way to the rear wall so that cables could still drop down behind the desk. The front and rear walls could be doors that swung open for access to cables (rear) and to drives (front), and the front door would be open at the bottom (à la bar room door) to allow fresh air intake. Essentially, that would be giving up on quiet fans and relying instead on a sound absorbing partial cabinet around the case. The reason that companies haven't offered them is that they are so low tech (and bulky and heavy) that there would be no profit in them. But that makes them perfect for the homebuilder. A problem though with this solution is that it also keep the heat inside. Sound absorbing material is usually also heat insulating. Secondly, our sound perception follows a logarithmic scale; a small audible reduction of 3 dB require a 50% reduction in sound energy. Read the description again. There is no top to this cabinet, and there is free convection in the rear since there is no floor under the rear cables, and the front door does not go all the way down to the desk surface. There is no interference with air flow, and there is no dependence at all on conduction. All this cabinet does is force most of the sound to bounce at least once off a carpeted surface. A reduction of more than 50% of sound energy is easy. I did a crude experiment of just suspending a 2'x3' sheet of carpet against the wall behind my midi tower, and the reduction in sound was surprising. *TimDaniels* |
#30
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On Sat, 27 Sep 2003 12:35:43 -0700, Biffo
wrote: On this day of our lord, Sat, 27 Sep 2003 10:42:28 +0100, Gary D. quilled: I replaced my PSU's fan with a Vantec Stealth 80mm fan (reviewed as being supposedly "silent") - it reduced the noise levels slightly but I still consider my PC to be as noisy as hell. Panaflow fans are apparently quieter than Vantec Stealth. Also you can get PSU's like the Zalman that run the fan in the PSU at very low rpm unless the temp get's inside the PSU gets over 50deg c. I didn't go for Panalflow fans because of an article I read on the web (can't remember where!) that said not all Panaflows were effective in noise reduction. I was only a matter of having read that article that made me go for Vantec, simply a matter of one choice over the other, although I suspect you could be right! Another factor I think might still be contributing to the noise levels I'm experiencing is that my PSU unit is a cheap one that came with my PC and the PSU box fan aperture is not quite as large as the fan diameter, so some of the air flow is hitting the edges of the box aperture and this, I guess, must be causing turbulence and thus the annoying "hiss". To remedy this would involve removing the entire contents of the box and expanding the fan aperture; even then I reckon any resulting improved aperture might have rough edges (using just DIY tools) and it's unlikely I would achieve a professionally smooth job. The PSU box used to have metal cross-members - which I cut away - and that helped a lot, but I think I've gone as far as I can on modifications so I'll just learn to live with the noise. --- You're never alone with - schizophrenia! |
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