[sf-lug] semi-OT: help with dying disk
matt.price at utoronto.ca
matt.price at utoronto.ca
Mon Mar 17 22:59:01 PDT 2008
went out of town unexpectedly, following up!
Quoting Rick Moen <rick at linuxmafia.com>:
> Quoting matt.price at utoronto.ca (matt.price at utoronto.ca):
>> the hard drive in my laptop is dying, with messages of this ilk:
>> so as regards recovery
> See, I'd not actually heard of GNU ddrescue, so hats off to Asheesh, for
> suggesting it.
ditto that! worked great.
>> then i have a second one, regarding a new disk. from the looks of it,
>> $150 will now buy either 200 gigs of 7200 RPM 2.5" disk, or 250 gigs
>> of 5400 RPM. any idea how the speed difference is likely to affect
>> both speed and power consumption on my laptop?
> Well, quite seriously, at least potentially. Mutatis mutandis, a drive
> that spins 33% faster will draw about that much more power and put out
> that much more heat. OTOH, speed ratings of laptop hard drives (exactly
> as with so-called "48x" CD drives) are a bit misleading, because of
> measures to keep them spun down a high percentage of the time.
right. see my answer below, i'm thinking i'll go with the slower drive.
>> this is a dell d820 laptop with a core duo cpu, so it's fairly quick
>> by my standards, but of course i wouldn't mind it being faster;
>> however, it's also a terrible power hog under linux, currently (with
>> what i believe is a 5400 rpm disk) barely staying up for an hour on
>> battery power.
> Gee, you might, at that sort of battery duration, want to check with
> other d8x0 users running Linux, because that sounds awfully slim. Maybe
> you might even need a new battery? Lithium ion cells do lose their
> capacity progressively over the years, whether you use them or not.
> The only cure, really, is to buy a replacement battery.
yes, my battery is damaged. i'd never had one go so quickly, and i
htought i'd been pretty good about the power sycle; just oges to show
though. but even with a good pattery the runtime is very short.
>> so i wondered, any comments on the likely speed/power tradeoff, and
>> also any hints about increasing disk lifetime?
> One factor that feeds into disk lifetime is heat. As long as your
> system is able to conduct or convect any generated heat away quickly
> enough, no problem (although it's of course better to not generate that
> heat in the first place, if you can avoid doing so). However, if your
> fans and fins aren't keeping up for some reason (hot day, blocked heat
> vents, etc.), then you get runaway conditions -- heat buildup.
> Heat buildup kills electronic components, and especially those on hard
> drives, more surely than just about anything else can.
well, my machine runs INCREDIBLY hot, so i suppose that's the answer.
it's gotten to the point where, if i want to watch a movie, i get an
icepack out of the freezer first. i don't even really know how to
diagnose this -- shouldn't some kind of temperature control be kicking
in? can i tell what's generating al lthe heat somehow? but i've
definitely been aware of the problem for a while -- tried to get some
feedback from the ubuntu lists about a year ago but got no responses,
iirc, and haven't dealt with it efficaciously since then.
> You'll notice that I haven't given you any easy, clean, bankable answers
> in the above. To my knowledge, there aren't any -- just a bunch of
> general principles that might or might not help you over the long run.
oh sure, take the high road on thisone! thanks for hte advice, though
-- it's probably more helpful than you realize, e.g., i've made a
decision already based on it...
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