I think you could use the 3.1 rom.... I have a 20GB connected right now, and I have used a kickstart3.1 maschine and os3.9 ... The methods of connecting was either a 4x IDE interface supported directly from IDEfix and now a FastATA1200 ... Though the fastata acts up, it is speedy, 6.544 kb/sec for a 5400rpm disk... using the 4x IDE and a 030, I got ~2,9MB/sec