The reasoning is quite solid, and unchanged with time. It does not make
sense to implement:
"After numerous debates, the consensus was that is was not a good idea
to add this functionality to HAL. It's was decided user-configurable
power management was not really required when modern hard disks have
really intelligent power management.
A disk on Low Power idle need less than 1 Watt per hour. For a normal
battery with 50000mWh you could run the hard disk for over 50 hours. If
you do not read/write from/to the hard disk the disk regulates power,
but never shuts down the device. The reason is easy: you lost more power
with each startup than to leave the harddisk online somewhere between
'Active idle' and 'Low power idle' (depends on the model/manufacturer).
The other reason to leave this to the internal power management of the
disk is: the time needed to reactivate the device. You lose more
performance than you lose power between 'Active idle' and 'Low power
idle'. If you use a journaling file system you normally need to flush
periodically. This could run in a race between shut down device and
restart device by system to flush. This means more power consumption as
you change nothing. You can't set power management for external USB hard
disks, because you can't send the needed commands over the USB link to
the disk."
** Changed in: gnome-power-manager (Ubuntu)
Status: Confirmed => Invalid
--
HDD spindown timeout
https://bugs.launchpad.net/bugs/33320
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