Jeff:
1) By default (i.e. on a desktop) flushing every 30 seconds can reduce disk I/O 
pressure (i.e. it reduces pressure later on because that data is already on 
disk).
2) Was that not mentioned? Disabling atime is usually among the first 
suggestions...
3) I don't think I'd go so far as to disable klogd and sysklogd. If your 
computer crashes or something untoward happens you will have no evidence of 
what happened in the run up.

Just out of interest aren't a whole bunch of these things controlled
when you use the laptop-mode package (see /etc/laptop-mode/laptop-
mode.conf for all the settings that can be controlled when its
installed) ?

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