@Swâmi,

I'm suspecting it may be that Precise is doing less disk activity now
that we've worked on fixing a bunch of applications + daemons that were
causing a load of (frequent) unnecessary writes.   I wonder if the
hdparm setting in /lib/hdparm/hdparm-functions when running battery is
too aggressive.  As an experiment, can you edit /etc/hdparm.conf and
after the line:

#apm = 255

add

apm_battery = 255

and see if this reduces the start/stops (it should do).

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https://bugs.launchpad.net/bugs/952556

Title:
  [Precise] [Hardware-killer] HD restarts every few seconds

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