Speaking of that, one of your old drives is probably of a slower speed (not UltraATA-133 or whatever). You could try moving devices around so that the CDROM is on the same chain with one of those slower drives. Of course, this causes problems under Windows, since you can't really change drive letters, and I don't know how to deal with that problem (maybe keep the drives in the same relative order?), so you'd have to figure that one out.