As do I, but not for their intended purposes. If I'm not mistaken a floppy drive, and either a second size floppy or an external drive like Zip. I use them for OS drives unrelated to the current OS in a multiboot system. Keeps them out of the way but still accessible, while the other drives remain constant. And at this point even D: is becoming obsolete. I haven't bothered installing a CD/DVD drive in ages. Not sure my case could even accommodate one.