Count each device's SCSI ID in sequence 0 to 7 (or 0 to 15), on each SCSI bus to confirm that no two devices have the same ID.
Note
The SCSI Host Adapter is normally set to SCSI ID 7, so this ID is usually not available for a device.
Check the SCSI Bus Termination
SCSI buses require termination at each end for proper operation. A typical external subsystem installation would be terminated at the SCSI host adapter and at the last device in the chain.
If an external device is being used with an internal device (on the same channel), the SCSI host adapter would now be in the middle of the bus rather than at the end. In this case, the termination would be at the internal device and the last drive in the external chain. The terminators on the SCSI host adapter would be removed. See your SCSI host adapter manual for directions on removing the terminators on the board.
Is there a terminator installed on each end of the SCSI bus?
Note
For
