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28 ST11950 and ST12550 Installation Guide, Rev. D
Changing other applicable jumper options
Barracuda 1 and 2 drives are designed to be used in a
variety of systems. Unique installations may require you
to change one or more of the other jumpers to meet
specific system requirements; however, in most cases,
you will not need to change any of these jumpers for
normal drive operation. Figures 9a and 9b provide the
information necessary to configure all N and ND drive
jumpers not discussed elsewhere in this manual.
Write Protect = On (disables writing).
Write Protect = Off
(enables writing – default).
J4
RES
WP
LED
Write Protect option (WP)
Reserved for factory use.
Reserved (RES)
SCSI
Connector
DC Power
Connector
J01
J4
Pin 1
Pin 5 (top pin in this illustration) is negative,
Pin 6 (bottom pin) is positive.*
Remote LED Connector*
*Note to subsystem designers: In Europe, a red LED indicates
an error or warning condition. For this reason, you may want
to use a color other than red with this connection.
RES
Figure 9a. Additional jumper options
for ST11950N/ND and ST12550N/ND drives