Be careful! The first (only if you are using only
one)
hard disk drive uses DS3. The RX50 rarely needs any
settings changed - I would not know how if asked since
I have never used more than a single (dual) RX50.
There is a single, unmarked, jumper on the seek/interface PCB in the RX50
-- the one mounted verticalled at the back of the drive that the
interface cables plug into. It's normally unjumpered. Jumering it will
change the drive selects from 0,1 to 2,3. I don't know if that's what
needs to be done, but it seems likely.
-tony