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Barracuda 4LP Installation Guide, Rev. B 41
W/WD drives
Figure 12. Using J1-Auxillary connector for model “W”
and “WD” drive alternate ID select and LED
connection
J1-DC Power
J1
68 Pin SCSI I/O
Connector
Drive
HDA
Rear
SCSI ID = 8
SCSI ID = 9
SCSI ID = 10
SCSI ID = 11
SCSI ID = 12
SCSI ID = 13
SCSI ID = 14
SCSI ID = 15
A
not used
3
A
2
A
1
SCSI ID = 0
SCSI ID = 1
SCSI ID = 2
SCSI ID = 3
SCSI ID = 4
SCSI ID = 5
SCSI ID = 6
SCSI ID = 7
A
0
J1-Auxiliary
Pin 1A
4P 3P2P 1P
PCB
Pin 1
+5V
Ground
(default)
A
0
A
1
A
2
A
3
1197531
12 10 8 6 4 2
Host Alternate
Usage Plug
Pins 1, 3, 5, and 7 are
optional connections to
switching circuits in host
equipment to establish
drive ID.
Remote Switches
For ID selection use
jumpers as shown or
connect a cable for
remote switching as
shown below.
Dashed area is optional host circuitry (external to the
drive) connected to host supplied optional usage plug.
+5V
Drive Activity LED
+5V
N.C.
Ground
Pins 2, 4, 6, and 8 are normally
not grounded. They are driven low
(ground) for 250 ms after a Reset or
PWR ON to allow drive to read
SCSI ID selected. Pin 8 may
also be used to drive the cathode
of an external Activity LED.