If you aren't running your machine in laptop-mode (which is an explicit
setting) it is expected that the hard disk will be accessed every few
seconds or so as data will be being written to the journal frequently to
the partition journal keep things consistent in the case of a crash.
Additionally, if you have atime reporting on (which is the default) then
accessing a file (even to do a read) will cause a write as the access
time of the file will be updated.

pdflush is a kernel thread and is almost certainly simply a messenger in
all of this. To the best of my knowledge it just periodically flushes
data back to disks.

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