You can change the drive by placement on the IDE cable inside the computer, the end pin connector on the cable would be the master position.
On the back of the drive is a series of pins with the letter S = Slave, M = Master. You would have to move the jumper shunt to the position you wanted.
Maybe some one on the forum can point you to a site with a diagram of what to do.
For Alan's question, I misstated the digital stereo. I have always had an analog hook up on my drives, and when I listened to the CD produced with the 1650, the separation was better than any of the other drives I have used.