pdflush will write to disk less if you put this at the bottom of 
/etc/sysctl.conf:
# From powertop
vm.dirty_writeback_centisecs=1500


After that, run sudo sysctl -p for the new changes to take affect. This was a 
suggestion from powertop which does seem to lower disk writes by increasing the 
amount of time between disk writes.

-- 
hard disk being accessed every 4 sec.
https://bugs.launchpad.net/bugs/17878
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