As a side-note about installing a significantly more modern disk in the IIci, something like a 10k server disk from the last five to ten years, heat will be a concern if you put too many of them in (two might be too many) -- most of those disks were designed for equipment in air-cooled datacenters where the machines were designed with either more space between disks or where air flows over the disks then through the rest of the machine.

Also, a single 10k disk will probably completely saturate any NuBus SCSI controller.