Castout - its supposedly as simply as changing the registry entry. Only one problem - if your current SATA driver doesnt support AHCI your screwed because on reboot - you will get no hard disk drive found halfway through the boot process. Its possible you could get back in with safe mode - but no guarantee. If you can then you can swap the reg entry back. If not - your doing a repair of your system at least - a full format and rebuild at worst.
Before you do this - make sure the driver your OS is currently using for the Sata controller supports AHCI. Just a word of warning. Again - I also have to say - why fix it if its not broke? There is no real performance gain unless your also running a raid array from what I have found.
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Good Hunting!
Captain Haplo
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