What kind of optical drive do you have?
One of my PC has a CD-RW 48x and the other has a 24x CD-Rom.
On my laptop I have a DVD player and CD burner. On my desktop I had a 52x burner, cd player, 8x DVD burner, and a DVD player.
Why do you have 4 optical drives on your desktop?
Or, do you mean you have four different desktop computers?