I have 3 u320 ultra320 scsi drives 72 gb in size. I have a mac classic and Mac IIFX where the hard drives just recently died. connecting my 2gb 50 pin drive to these machines, they work fine. when i use a 50/68 pin adapter and connect the u320 drives, they dont work. They dont show up in drive setup or apple hd sc setup. on the iifx, when i disconnect the origional drive I cannot boot from CD either, like that orig drive does something special. help?