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46
W/WD/LW drives
68 Pin SCSI I/O
Connector
J1
SCSI ID = 0
SCSI ID = 1
SCSI ID = 2
SCSI ID = 3
SCSI ID = 4
SCSI ID = 5
SCSI ID = 6
SCSI ID = 7
SCSI ID = 8
SCSI ID = 9
SCSI ID = 10
SCSI ID = 11
SCSI ID = 12
SCSI ID = 13
SCSI ID = 14
SCSI ID = 15
not used
Host Alternate
Usage Plug
+5V
+5V
N.C.
Ground
Dashed area is optional host circuitry (external to the
drive) connected to host supplied optional usage plug.
Figure 12. Using J5 connector for model "W," "WD," and
"LW" drive alternate ID select and LED
connection
Barracuda 18 Installation Guide, Rev. C
+5V
Ground
Pin 1
A
3 A 2 A 1
A 0
11 9 7 5 3 1
12 10 8 6 4 2
Drive Activity LED
J5
Pin 1
J1-DC Power
4P
3P2P
(default)
For ID selection use
jumpers as shown or
connect a cable for
remote switching as
shown below.
Pins 1, 3, 5, and 7 are
optional connections to
switching circuits in host
equipment to establish
drive ID.
A 0 A 1 A 2 A 3
Remote Switches
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.
Drive
HDA
Rear
1P
PCB
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