Hi,
I don't know the disk-size-limit of FFS from WB 1.3, but the maximum size of a single partition is 2GB. I think the maximum size of a disk is much larger, cause the disk is addressed in blocks of 512 byte and the Amiga is able to address upto 2 billion of these blocks.
I would try to split the hd into partitions of less than 2GB, that should work.
Noster