Henrique de Moraes Holschuh wrote:
On Tue, 07 Aug 2007, Tejun Heo wrote:
emergency unload. Emergency unload does shorten the lifespan of the
disk but you don't have to worry too much about it. Disks are designed
to withstand certain number of emergency unloads.
You *do* have to worry about it in any box you turn off daily. Desktop HDs
will croak fast in that scenario, laptop HDs less so, but still too fast.
A very good laptop HD can last about 20k emergency unloads (this is a unit
that can do about 600k normal unloads in its lifetime). Desktop and server
HDs don't even come close to those numbers, last time I checked.
It only matters on hard drives which actually use load-unload heads.
Lots of desktop/server drives (perhaps some laptop ones as well) still
use contact start/stop, which doesn't remove the heads from the platters
on shutdown but just parks the heads over the landing zone. I don't
think arbitrary power-offs make too much difference on those drives.
(However, these generally aren't rated to handle as many start/stop
cycles, which is why laptop drives generally use load/unload instead.)
--
Robert Hancock Saskatoon, SK, Canada
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