Similar problem at  Compaq Presario C300 with HDD WD800BEVS-60LAT0.
HDD is warmer then on win XP about 7 centigrades on ubuntu (9.04 i 9.10), and 
on openSuse 11.2 , Load/Unload Cycle goes up with similar rate ( 20 per hour or 
less) at default settings. 
If i change them with hdparm -B 253  Load/Unload Cycle skyrockets  (150 per 
hour) but temperature goes down only 2-3 centigrades, and it is still higher 
4-5 centigrades then on XP.
Other lower then 253 settings with hdparm -b don't change anything. 
Temperature on idle on win XP 39, on Linux 46, under heavy load on XP 43 and  
on ubuntu and suse 50.

It seams like WD Scorpio problem with Linux, I don't know how other
drives behave.

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HDD unusual high temperature and activity in Ubuntu Jaunty
https://bugs.launchpad.net/bugs/394826
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