sting wing, 

although there isn't really anything left to add to Bobs reply (which is good 
work, as expected); but just for the fun of it, some related ideas.

If you need to monitor harddrive temperature, then possibly you've already 
reason to fear overheating, and you finally would need to lower the temperature 
generally, right.

There are settings in the BIOS as well as in the desktop settings what to do 
after so much idle time (or tools like 'sleepd', or you could  screw some 
hdparm -f -Y command into the right places.) However, that does not really work 
since there are too many processes doing continuous small disk writes, like 
logs and network activities. Therefore, you should configure as much things as 
possible into RAM (see /etc/default/tmpfs) and even link specific folders 
there. As a small demonstration, some image viewers clutter your disk with 
large amounts of thumbnails in ~/.thumbnails, and you could make that a 
symbolic link to a /tmp/thumbnails folder which you create at desktop launch, 
via autostart script. (I invented this just now, not tested.) The thumbs will 
be lost, after shutdown, but usually most of them are obsolete anyway. Highly 
experimental would be /var/log mounted as tmpfs :) but why not.

However, if you've got serious overheating, then the real solution is to get 
the heat out of the computer. With PCs for example i tend to use external 
drives for the busy system partitions. In very modern laptops you would have an 
internal flash disk anyway, which probably don't produce much heat. But a 
simple thing you can do is to clean the inbuilt fan from heavy dust and you may 
even consider to open up some additional slots in the case, manually, or make 
the existing one larger (loosing warranty of course).


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