I never said that RISC OS does not have *any* disc cacheing, just that it is not very "substatial" (wording taken from nunfetishist).
Experience shows that HDDs used in RiscPCs have lasted much longer than the same model has in a PC. And my computers have never suffered bad configuration or too little memory. 1 GB RAM in my current desktop PC, 512 MB in my current laptop, 256+2 MB in my RiscPC, 512MB in my Omega (firmware release 14 finally solved the last problems, Select now runs fine .
This has all ben discussed to death before. I don't see the point of doing it again.