I hope this information is useful. Change the mode jumper on the PD drive to non-DOS mode. I soldered a switch across the mode jumper connections and routed it the the back panel. The other position is of course Linux. So before I boot my system I decide which OS I'll be using and set the switch accordingly.
History shows it staying in the Linux position more and more.
Reboot your system. Update the fstab for both CD and PD drives. Use appropriate mount command. I did try moving my primary SCSI drive to 6 but experienced some difficulties.