Jamseshuang, did you install gentoo on your raid 0, dual boot with windows? I mean on the raid0 directly, not the linux software raid.
Gentoo is using 2.6 kernal now and not support ataraid anymore. How did you do that?
I ever tried gentoo with 2.4 kernal but didn't have a success. During the installation you have random crash down. I guess it is because of DMA once again. Gentoo by default switches on the DMA but that causes the raid0 problem.