My external Zip drive alternates between by desktop and my laptop, so I have the same concern. Actually, the new laptop I'm getting poses an interesting question (if I were to install Poser on it). Virtually all new laptops come with swappable component bays, so you could have a DVD drive and a CD (or CD-R/CR-RW) drive in, and then later that day have swapped out the CD or DVD for a removeable hard drive, or a 3.5" floppy, or a spare battery. So what happens then?