Setting up raid O in disc utility

I want to create a raid O in Disc Utility on my Mac Pro 2.8, 8 cores.
I have 2 drives that i've been using in my previous powermac G5 stripped as Raid O with a Sonet 8 port E-Sata controller card, they worked fine and fast.
In my Mac Pro do I need an E-Sata Controller card like one from Sonet with 4 ports in order to achieve a raid configuration and speed?
With out a controller card, stripping 2 drives, does Leopard sees the 2 drives as one large drive without the speed?
Another question, when stripping the drives as a raid O configuration it asks which as an option the sector block size, 16, 32, 64, 128, and 256,
for video editing which sector size be best suited.
any suggestions would be appreciated.
thanks
Sigi

{quote:title=In my Mac Pro do I need an E-Sata Controller card like one from Sonet with 4 ports in order to achieve a raid configuration and speed?}{quote}
If you want to do software raid 0 with external drives or enclosures, then you can use either the ODD sata ports to esata adapter OR any esata controller card. Doesn't have to be from sonnet (although they are very solid).
{quote:title=With out a controller card, stripping 2 drives, does Leopard sees the 2 drives as one large drive without the speed? }{quote}
This question is a little confusing...first, you don't need a controller card to stripe 2 drives together. It can be done merely in disk utility. Also, whenever you make a raid, it always shows up as 1 drive.
For the block size, if you're doing mainly video, higher sizes will be better, as your files are bigger in size. I've never heard much on using 256K, but afaik the video norm is 128K. However, if your files are very large, I don't see why not to go for 256K.

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