What does "buffers" and "cache" mean?

[Tobias Kraus <tobias.kraus@stud.tu-muenchen.de>]

Hi ML,

I'm wondering for quite a while what the fields "buffers" and "cache" of the 
command free mean. I think that one of these is the value for caching HD-IO, 
but which one? And what's the other? Neither man, books nor google gave me an 
satisfying answer. Could anyone of you give me an STFW or RTFM hint?

Thanks,

Tobias

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