Intel RST + AHCI/IDE mismatch between Windows and BIOS = high cpu

[mikeymikec]

Well, there's something new I've learnt

http://communities.intel.com/thread/16881

I'm honestly wondering whether a BSOD would be more helpful than "you got the settings blatantly wrong, but instead of drawing it to your attention I'll just grab half the processor time".

I forgot to check the setting after faffing around with my wife's machine recently. Oops.