I cannot see the disk, that's why I think I cannot boot from it. I can see the controller via SCSI Director 4 or Anubis tool, but not the disk when it is connected to the controller. The same happens with the existence of a terminator.

For the moment, as SEIV is unusable with the BIOS 1.65, I am using an adaptor from the back side external SCSI of the Quadra to 68 pin female. With this type of connection the hard disk boots correctly. That's why I am asking for the new BIOS for SEIV...