How many disks?

I have recently purchased Adobe Premiere Pro CS3 and did not make progress about how many HD are preferable to speed up this application and specially the rendering + export to DVD : the Help pages are still very vague...like in my old version 1.0 !
My question: is a single volume array Raid 0 (2 x 250 GB)for all the A1Pro files better than several HD, up to 5 like suggested (!), regarding editing performances?
Thank you to help me to fill this gap.
So far, my config:
WinXpProSp2 ; P4 2.6 Ghz ; Ram 2GB ; 1 Seagate 160 GB 7200.7 for OS ; 1 Seagate (idem) for Captures ; 2 Seagate 200 GB 7200.7 in Via Raid 0 for Projects and all the files generated by A1Pro CS3.

yes Hd's are not going to mater much in rendering depending on the amount of effects and layers the cpu cant render faster then the standard harddrive can write. adding raid is going to gain performance with i/o for instance dvcprohd is 100mbs so unless you have a goo hardware raid you arent going to get that many streams of dvcpro hd footage working

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