Some people think it will reduce performance, others think it will not. So I guess the answer is to try it and see what happens...it won't break anything. My guess is that it will not hurt performance.
It will only run as fast as the regular IDE drive. It won't run at ata-100. I learned this when i got my cd-rom drive and found out that my hard drive was only running at ultra-33 and not 66 that is why i have my cd-rom and cd-burner on the same cable(controller 2) and the hard drive on controller 1.
Right, but you can copy straight across non-on-the-fly, by having the program create an image file first. It's still one step as far as you're concerned, but it's really two. If your program is reading and then writing, you created an image file. If it just does one long read/write, then you did it on-the-fly.
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Apple? Macintosh? What are these strange words you speak?