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SubjectRe: Is hdparm safe to run under some disk load?
> So: 1) Can/should 'hdparm -c' be run while there is disk activity?

You should be ok.
Off the top of my head, here are my parameters:

/sbin/hdparm -A1 -c1 -d1 -m32 -u1 -W1 -Z /dev/hda

This is on an older Seagate drive and it makes a world of difference.
Make sure you have the appropriate chipset support compiled in.

> 2) How good are the guesses of 'hdparm -c'? Or, how likely is it
> to misdetect some feature which is then enabled and crashes the
> machine.

Real good in my experiences..
The one that bites you in the ass the most is '-u1', but I only saw that
on an anchient '386.

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