### A drive is Defunct on controller [number], channel [number], SCSI ID [number].

Explanation: One of the following occured:

- Error in communication between the drive and the adapter.
- Adapter failed.

Action:
Check in the following order:

- Power to external enclosures, connections
- Cables for proper seating
- Damage or bent or pushed pins, termination (for non-back plane systems), back planes, drives and adapter.
- If no connection problems can be identified, then the replacement order for parts is termination (for non-back plane systems), cables, backplanes, drives and adapter. Before replacing a drive or adapter ensure that they are updated with the latest firmware and still fail.