i have burner on one ide channel, dvd and a hard drive on another, and udma 66 drive on its own, i can play games from the dvd while burning off of the hard drive the dvd's on, while playing mp3's off the other hard drive thats alone. wierd thing though, i was burning mp3's from one hard drive, and playing a game off the other hard drive, and the game was very jumpy jerky, wierd