Not so fast!
First only both end devices attached to the SCSI chain must be terminated.
Normally they are the SCSI controller itself and a terminator or the last SCSI device attached.
On A4000T there is a passive terminator in the main board (SCSI controller terminator) and another terminator on the back of the case.
If so, just turn off the CD/DVD termination jumper. Read the datasheet from the model you are using.
