AHCI vs IDE

I have a Gigabyte UD3 board with an I7 860 and a seagate 7200.12 1tb HD.

What is the difference in ACHI and IDE mode for the sata connectors?

And which one should i be using?

Im running XP 32 bit right now but have Win 7 64 bit on the way. Plan on dual booting just in case i need the 32 bit for something.
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  1. Thanks that helped. I had the same question.
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