>  Have you ever heard of the concept of disk caches? You can even configure
> how much is cached.

Isn't Vista's SuperFetch just a very clever disk cache that uses more RAM 
than its predecessors?

Really, what is the disadvantage with keeping as much stuff from disk in RAM 
as possible?  It just seems silly to me to erase stuff from RAM for the sole 
reason of making the "free RAM" counter higher, why not just erase it later 
when that RAM is actually needed by something else?

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