I have been receiving some PMs about it so here it is.
This uses Darwin open source code so it is OK with the moderators.
Add this to your /System/Library/Extensions directory
Make sure you rename (or delete) the AppleGenericPCATA.kext to AppleGenericPCATA.kext_disabled
command = "mv /System/Library/Extensions/AppleGenericPCATA.kext /System/Library/Extensions/AppleGenericPCATA.kext_disabled
EDIT: Somtimes, the AppleGenericPCATA.kext extension has been found in the System/Library/Extensions/IOATAFamily.kext/Contents/PlugIns directory.
Remove or rename it from there too.
If you run into a problem, you can use the trial version of MacDrive to access your installation partition from XP.
If you are not comfortable with all these strange unix commands, you can enable the root user that allows you to perform all these manipulations with the GIU.
2007-04-11 (Fix typo in command)