Fuji 2266SA problem

[Tad Guy]

Does anyone have experience with Fujitsu 2266SA disks in power series
workstations?  I've installed these disks in three of our hosts (a
4D/210, a 4D/320 and a 4D/340 all running Irix 3.3.2), and they seemed
to work fine.  However, now that they are getting serious use, I've
begun to see this message appear in SYSLOG:

	dks0d2s10: Unrecoverable device error: Internal controller error.

(Descriptive, huh?)  

Often this message seems benign, but occasionally an inode on that
disk will become locked and attempts to access it result in the
accessing process hanging in disk wait.  The only fix I've found so
far is to reboot, and then the filesystem does NOT appear corrupted
when fsck checks it.

I've reformatted, but that didn't change the behavior.  The formatting
occurred without error.  The drive is the only terminated device on
the bus, and is the last device on the chain...

I suspect I need to change a config jumper on the drive, but don't
know which one(s) are suspect.  The current jumper settings are below.
With the exception of the SCSI command level and the sync mode being
disabled, these are the factory settings.

Any suggestions or solutions would be appreciated.  
	...tad

Drive:
	Fujitsu 2266SA
Host:
	Silicon Graphics 4D/320VGX w/64M memory, running IRIX 3.3.2
Legend:
	1 = short (closed)
	0 = open

CN3:	1111010
            ^^^-- scsi target = 2
	   ^----- time monitoring enabled
	  ^------ read-ahead caching enabled
         ^------- reserved
        ^-------- normal operation mode

CNH1:	11111111
              ^^- ack signal wait monitoring time == infinity
              ^^- selection monitoring time = 250ms, 128 retry 
             ^--- unit attention report mode = respond with check cond status
         ^^^^---- reserved
        ^-------- led display operates with scsi bus 

CNH2:   01111110
               ^- synchronous mode disabled
              ^-- synchronous transfer rate = 0.96 - 4.8MB/s
             ^--- parity check enabled
            ^---- motor start on power on
           ^----- per default value = 0
          ^------ check condition status not posted on parameter rounding
         ^------- save data pointer issued for disc after data transfer
        ^-------- scsi level = scsi-1/ccs (have also tried scsi-2, same)

CNH4:	11
	^^------- connecting termpwr pin and terminating resistor
	          and connecting power to termpwr pin
                  and connecting power to idd terminating resistor