My CPU is an E8500 (x64), the Mb asus p5n-t deluxe, the raid controller on the bios/Mb correctly recognizes the raid 5 as 2.72 TB (so it's ok). My OS as said before is Vista. This Raid 5 is not my boot partition, just data storage.
So up to this I'm all good, the problem is that vista SP1 doesn't even consider existing that raid, differently from non SP1 (recognizing it wrongly, but because it was not GPT).
Actually i created the raid from the bios feature, and there's no option about to convert it to GPT.
So I'm flooding...