Actually the partitions are out of the first 4G.
But is it possible to mount them manually?
If you want to see partitions beyond 4Gb without running setpatch, the only way you can do without rebooting is to have a 3.9 ROM - which contains the updated scsi.device. (did somebody out there make a batch of 3.9 ROMs?)
Otherwise, you have to use either loadmodule or setpatch to update the scsi.device - and both will require a reboot. I think there's also IDEfix97 or something, but that also requires reboot.