I don't think so. The 48gig is an IBM drive. Those are master by default when there are no jumpers attached to it (I've just checked the IBM site to be sure)
The jumper setting is correct.

Riocar 10gig (for now) S/N : 10101747 red
_________________________
Riocar 80gig S/N : 010101580 red
Riocar 80gig (010102106) - backup