Seagate BARRACUDA ST11950N/ND/W/WD - Manual (Page 23)

ST11950 and ST12550 Installation Guide, Rev. D 21
Also check your system or controller user’s manual to
ensure that you have not violated its SCSI ID numbering
recommendations.
SCSI ID = 0
SCSI ID = 7
SCSI ID = 1
SCSI ID = 2
SCSI ID = 3
SCSI ID = 4
SCSI ID = 5
SCSI ID = 6
J4
ID2
ID1
ID0
Select SCSI ID by placing
jumpers as shown below.
SCSI
Connector
DC Power
Connector
J01
J4
Pin 1
Figure 3. Setting the SCSI ID on N- and ND-type drives