I don't know, I am not sure if I want to know... At one point I had a machine that had a Zip drive, a sound card, and a CD burner. I could easily get any 2 out of the three to work. Getting all three to work at the same time eluded me. Then (as far as I can tell) someone put a common 3.5" floppy into the Zip drive, so I no longer have the concern of getting the Zip drive to work with all of the others...