As other pointed out, no.... You can't hook up a Disk II or 5.25" controller to a 3.5" disk drive.. However, a 3.5" drive can be used in an Apple IIe (not sure about II, II+). There are two possible combinations: - Apple sold a drive called a UniDisk 3.5. This drive had a processor and buffer memory inside the case to allow it to buffer and effectively slow down the data transfer rate to the point where the Apple IIe could handle it. You still need to get a special controller card (often referred to as a "LIRON" card, because the word was silkscreened on the card). - Apple also sold a 3.5" drive controller card that had the processor/buffers/logic on the card, so you could use the standard 800KB drives from an Apple IIgs in an Apple IIe. This card also had the capability to drive Macintosh 1.44MB drives (so you could get 1.44MB on an Apple IIe!!). Coincidentally, I have one of these for auction on eBay right now (search for seller "rbeaudry") :-). You'd still need to get drives, but Apple IIgs 800KB drives are cheap and plentiful (in fact, I have several spares I could make available). Confusingly, both card were named by Apple as "3.5 controller cards", so be careful when looking fo rthem that you get the right card/drive combination.... Rich B.