I believe you can make it B:, at least I know you can in Win98 by this trick. All you need to do is slap a jumper on the middle pins on the back of your Zip drive. Look at the jumper diagram, it'll have no jumpers for Slave drive, and it'll have something like Slave A (or Slave B or Alternate or something). You just need to play with the jumpers and it'll make it B:. Good luck.