Just plunk a scsi drive on the UW controller (making sure you have active termination at both ends); go into HDToolbox and change scsi.device to cyberscsi.device (or whatever the Phase 5 scsi controller device name is) and you should be able to partition the new drive..provided it's terminated right. With 3.1 keep your partition size less than 2Gb and don't format more than 4Gb of the UW drive (you can always install 3.9 or the TD64 patch later to access all of the drive). No need to remove the ide drive, just set the new scsi drive sys: partition to a higher boot priority than the sys: partition on your ide drive (but less than df0:). Hold down both mouse buttons, boot off the ide drive one last time. Format the new scsi partitions (quick format is fine); copy over your old ide sys: partition to the new sys: partition on the scsi drive and reboot. Presto, your now working off the new scsi boot drive. You could always just leave the old ide setup in your system as a backup. That's what I do, it can't really hurt provided your machine has adequate ventilation.