harddrive no memory ---FreeBSD scenario

[Rudy Rockstar]

   If I had say a 15k rpm drive, would it be possible to configure the
   FreeBSD kernel to not use system memory and ONLY the hard drive for
   caching instructions and executing operations?

   Can FreeBSD be built to run on a system memory free system (can we
   also circumvent the system cache for that matter), if not is it very
   difficult to make it run on such a systemme.
   regardz,
   ~Rudy
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References

   1. http://www.rudyrockstar.com/
   2. http://g.msn.com/8HMAENUS/2728??PS=47575