I finally fixed on my laptop (Acer Aspire 1662, Kubuntu Gutsy 7.10 - HD
Hitachi Travelstar 60 GB) by editing the file:

/etc/hdparm.conf

with:

/dev/hda {
apm = 255
spindown_time = 255
}

No more parking at all and non problems of over-heating.

My girlfriend's laptop (Toshiba A100, Kubuntu Gutsy 7.10 and HD Toshiba 120 GB) 
reached about 26000 cycles in about 110 hours of use.
The option below (apm=255) seemed not to do anything. I tried apm = 254 and it 
stopped clicking at all but the operating temperature of HD was increased 
dramatically. So I choosed a value of apm = 210 which caused a good compromise 
between parking and over-heating.

I hope my personal experience could be useful...

-- 
High frequency of load/unload cycles on some hard disks may shorten lifetime
https://bugs.launchpad.net/bugs/59695
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