[Bug 59695] Re: High frequency of load/unload cycles on some hard disks may shorten lifetime

[Dennis Noordsij]

Milo: it just means your disks default settings do not trigger within
the 5 seconds of the forced flush. This is purely coincidental and
nothing to do with "broken" disks.

It is also the reason so many people see so many different results,
depending on your drive's settings you may never see it, or you may see
12 parks per minute.

BUT, this in no way invalidates that it does not make any sense to have
any APM when not using laptop_mode, and that it is the cause for the
load cycle count increases.

Dan: if APM is 255/254 it should be fixed, but for example on my
standard Hardy (with backports) it is re-set to 128 on resume-from-
suspend, and goes clickity-click.

If a drive "wakes up" with a different setting than it went to sleep
with, fair enough that is stupid on the drives part, but, like many
other devices which get reinitialized, the OS should make sure the
driver is in the correct state (no APM if it wasn't set before), and
that just brings us back to the main issue: no APM when not in
laptop_mode

-- 
High frequency of load/unload cycles on some hard disks may shorten lifetime
https://bugs.launchpad.net/bugs/59695
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