DeepIron has some good points. Before you start doing raid, you need do tell us WHY your wanting to do it. Are you looking for speed, data redundancy or both? If both your looking at Raid 0+1 or Raid 3 at a minimum - with 5/6 being preferable. Though that gets into 4 disks or more. Raid 0 can be done with just 2 - though your doing nothing but getting a speed increase, and no data recovery.
If you need fault tolerance - then you can go with a software raid over multiple disk controllers. If your looking for speed - avoid ALL software raid solutions. Unfortunately, I don't know of any raid cards that have both controller sets on them. Your best bet if you wanted to raid would be a dedicated raid controller card - and make both drives sata. (Do they even make raid IDE cards anymore?) Given the cost of drives today, this may be the best option for you.
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Good Hunting!
Captain Haplo
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