And exactly what does "termination" mean in this case?
http://www.pcguide.com/ref/hdd/if/scsi/cablesTermination-c.htmltl;dr Terminators stop signal reflection and are built into every SCSI device these days, however they must only be enabled on the furthest devices away from each other and not on devices between. If you only have a 2091 and a card reader, then both should have termination enabled (the 2091 is just as much a SCSI device as a hard drive). If the cable has more than two connectors then use the ones at each end.
