Recommended hard drive temperature
in [Storage]
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From: Folkert Rienstra on 21 Apr 2008 18:25 Arno Wagner wrote in news:6735naF2lsdshU1(a)mid.individual.net > Previously Franc Zabkar <fzabkar(a)iinternode.on.net> wrote: > > On 17 Apr 2008 20:56:34 GMT, Arno Wagner <me(a)privacy.net> put finger to keyboard and composed: > [snip babbleshit] > > > > > > Arno > > I demonstrated elsewhere in another NG that in Seagate's case the Good for you, babblebot-2. The world's a whole different place now. > > "seek error rate" figure is actually a count, not a rate, Aah, but on other makes it is a rate then. How interesting. What -in your expert opinion- would the purpose of such a 'rate' (not a count, mind you) be. > > and it is a count of the total number of seeks, not seek errors. Bummer. Have you informed Seagate of their 'error'. > > I did this by performing a zero fill operation on a 13GB drive and > > recording the SMART "seek error rate" parameter before and after. > > > See ... > > > http://groups.google.com/group/microsoft.public.windowsxp.hardware/msg/2ac63d875bfaf0d4 > > > ... for my results. > > Ah, yes. Bottom line, the "Seek Error" Attribute is pretty meaningless, > if you do not know the specific drive. Gee Babblebot, maybe there is something to the term "vendor specific", after all. > > Arno
From: Franc Zabkar on 22 Apr 2008 02:12 On 21 Apr 2008 23:04:10 GMT, Arno Wagner <me(a)privacy.net> put finger to keyboard and composed: >Previously Franc Zabkar <fzabkar(a)iinternode.on.net> wrote: >> On 21 Apr 2008 09:48:45 GMT, Arno Wagner <me(a)privacy.net> put finger >> to keyboard and composed: > >>>Previously Franc Zabkar <fzabkar(a)iinternode.on.net> wrote: > >>>> What about fluid dynamics? Maybe there is an optimal temperature for >>>> the platter lubricant and/or air bearing. >>> >>>Possibly. Many drives in the Google study should actually >>>be pre-fluid bearing, if I remember correctly when they became >>>mainstream. A part would be FDBs though and maybe there is some >>>increased vibration effect or the like at lower temperaturers. > >> When I wrote "fluid dynamics", I was referring to the air flow under >> the R/W head, ie the air bearing, not the motor bearing. > >Ah. That would be a different type of dynamics, that, while having >some fluid properties, is not fluid dynamics. http://en.wikipedia.org/wiki/Fluid_dynamics "Fluid dynamics is the sub-discipline of fluid mechanics dealing with fluid flow: fluids (liquids and gases) in motion. It has several subdisciplines itself, including aerodynamics (the study of gases in motion) ... Fluid dynamics has a wide range of applications, including calculating forces and moments on aircraft ..." .... and on flying disc heads? - Franc Zabkar -- Please remove one 'i' from my address when replying by email.
From: Arno Wagner on 22 Apr 2008 20:46 Previously Franc Zabkar <fzabkar(a)iinternode.on.net> wrote: > On 21 Apr 2008 23:04:10 GMT, Arno Wagner <me(a)privacy.net> put finger > to keyboard and composed: >>Previously Franc Zabkar <fzabkar(a)iinternode.on.net> wrote: >>> On 21 Apr 2008 09:48:45 GMT, Arno Wagner <me(a)privacy.net> put finger >>> to keyboard and composed: >> >>>>Previously Franc Zabkar <fzabkar(a)iinternode.on.net> wrote: >> >>>>> What about fluid dynamics? Maybe there is an optimal temperature for >>>>> the platter lubricant and/or air bearing. >>>> >>>>Possibly. Many drives in the Google study should actually >>>>be pre-fluid bearing, if I remember correctly when they became >>>>mainstream. A part would be FDBs though and maybe there is some >>>>increased vibration effect or the like at lower temperaturers. >> >>> When I wrote "fluid dynamics", I was referring to the air flow under >>> the R/W head, ie the air bearing, not the motor bearing. >> >>Ah. That would be a different type of dynamics, that, while having >>some fluid properties, is not fluid dynamics. > http://en.wikipedia.org/wiki/Fluid_dynamics > "Fluid dynamics is the sub-discipline of fluid mechanics dealing with > fluid flow: fluids (liquids and gases) in motion. It has several > subdisciplines itself, including aerodynamics (the study of gases in > motion) ... Fluid dynamics has a wide range of applications, including > calculating forces and moments on aircraft ..." > ... and on flying disc heads? Oh, ok. Different usage in my physics course (which was in german), it seems. Arno
From: Folkert Rienstra on 23 Apr 2008 14:31 Arno Wagner wrote in news:677f78F2nlmkvU1(a)mid.individual.net > Previously Franc Zabkar <fzabkar(a)iinternode.on.net> wrote: > > On 21 Apr 2008 23:04:10 GMT, Arno Wagner <me(a)privacy.net> put finger > > to keyboard and composed: > > > > Previously Franc Zabkar <fzabkar(a)iinternode.on.net> wrote: > > > > On 21 Apr 2008 09:48:45 GMT, Arno Wagner <me(a)privacy.net> put finger > > > > to keyboard and composed: > > > > > > > > Previously Franc Zabkar <fzabkar(a)iinternode.on.net> wrote: > > > > > > > > > What about fluid dynamics? Maybe there is an optimal temperature for > > > > > > the platter lubricant and/or air bearing. > > > > > > > > > > Possibly. Many drives in the Google study should actually > > > > > be pre-fluid bearing, if I remember correctly when they became > > > > > mainstream. A part would be FDBs though and maybe there is some > > > > > increased vibration effect or the like at lower temperaturers. > > > > > > > When I wrote "fluid dynamics", I was referring to the air flow under > > > > the R/W head, ie the air bearing, not the motor bearing. > > > > > > Ah. That would be a different type of dynamics, that, while having > > > some fluid properties, is not fluid dynamics. > > > http://en.wikipedia.org/wiki/Fluid_dynamics > > > "Fluid dynamics is the sub-discipline of fluid mechanics dealing with > > fluid flow: fluids (liquids and gases) in motion. It has several > > subdisciplines itself, including aerodynamics (the study of gases in > > motion) ... Fluid dynamics has a wide range of applications, including > > calculating forces and moments on aircraft ..." > > > ... and on flying disc heads? > > Oh, ok. > Different usage in my physics course (which was in german), it seems. And, as we all know, german physics are different from the rest of the world's physics. That explains it all. Thanks babblebot, you nailed it, once again. What should we do without you, eh. Imagine that. > > Arno
From: Franc Zabkar on 23 Apr 2008 16:28
On 17 Apr 2008 20:56:34 GMT, Arno Wagner <me(a)privacy.net> put finger to keyboard and composed: >Seek errors are due to modern drives >starting reading before the heads have settled. This usually works, >but when it does not work it becomes a seek error. I've been searching for references to support your statement but I haven't had any luck. I know from personal experience that older drives could be commanded to seek with a positive or negative track offset. Positioning the head slightly off-track and attempting a read was commonly done during low level formatting to test the integrity of the data surface. Any track that failed would be taken out of service and replaced with a spare. Servo offsets could also be used when recovering data from marginal sectors. I notice that some Seagate product manuals specify a lower number for average seek time during reads as opposed to writes (8.5ms versus 10ms). Track-to-track seeks are also lower (0.8ms versus 1.0ms). I don't know whether this reflects the operation of the drive's read ahead cache or whether it supports your claim regarding a "preemptive" read strategy. - Franc Zabkar -- Please remove one 'i' from my address when replying by email. |