It means both of your CD drives are on the same IDE cable/controller/slot on the motherboard, I'm guessing. Not much else it could mean... And why it reccommends different ones? Who knows... I burn all the time with my CD drives on the same one, my hard drive on the other.
Ep, glad to see you come back and tidy up...did want to ask a one day favor, I want to enhance my resume , was hoping you could make me administrator for a day, if so, take me right off since I won't be here to do anything, and don't know the slightest about the board, but it would be nice putting "served administrator osnn", if can do, THANKS