Well Frank, I thank you for your kind(?) answer. You know, I DID in fact use Google and I found a very similar response to yours on some generic website. Then I came up with this silly idea that maybe I would try the forums over at StorageReview to see if it had already been discussed. I did a search for "ATA100 AND ATA66" hoping to find a thread with both of those in it, but the three results did not shed light on my topic. So I figured, what the heck, I'll become a member, post my topic and see what the people here have to say. I'm sorry I didn't do things quite the way you wanted me to, but I guess with your 227 posts, you have every right to tell me what bridge I can jump off of....
ehurtley, thank you very much for the detailed answer. It was very helpful and I appreciate you taking the time to not berate me like other members here seem to find necessary....I guess that's what happens when you are a new member....