Since the firmware for those sidecars are built in to the sidecars I don't think the advice I was about to give about AmigaOS 3.5+ being reccommended for a 4+ gig hard drive would be relavent. If it is relavent you'd be able to format a boot partition of a couple hundred megs and then use the later AmigaOS to install the 64-bit capable filesystem on the work partition (the rest of the drive).
One thing is certain: You can't format a big drive to just one partition and expect a classic Kickstart ROM of any version to boot it.
