I found one of those in a Duo 280c with a 1GB IBM / Apple ROM drive attached. Since I don't think Apple shipped drives that big in the 280, it must have been an aftermarket upgrade. This drive is rated 5V 500mA also. It works, and I haven't done any further tests to see how big a drive it can handle or anything. Since 68K Macs don't handle iPhoto or iTunes libraries, they don't need huge drives in them. The exception is the Quadra 950 which already has four 9GB IBM SCSI drives in it, and it has long been retired as the digital audio workstation and main archive / server.