Thanks for reporting this bug and helping make Ubuntu better. The bug you have
mentioned has been debated by the developers, and they have decide to not fix
the bug. There reasoning is explained below, and can be found at:
http://live.gnome.org/GnomePowerManager/FAQ#head-e6d48e4196eb363908fb71975a5311f11f8dd9e4
Please report any additional bugs that you find!
GNOME Power Manager doesn't spin down my hard-drive!
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
powermanagement was not really required when modern hard disks have
really intelligent powermanagment.
A disk on Low Power idle need less than 1 Watt per hour. For a normal
battery with 50000mWh you could run the harddisk for over 50 hours. If
you do not read/write from/to the harddisk 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 powermanagement 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 powermanagement for exteral USB
harddisks, because you can't send the needed commands over the USB link
to the disk.
** Changed in: gnome-power-manager (Ubuntu)
Status: New => Won't Fix
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g-p-m keeps disk spinning
https://bugs.launchpad.net/bugs/315970
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