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.
SCSI
Connector
DC Power
Connector
Write Protect option (WP)
J01
Pin 1
J4
WP RES
RES LED
J4
Write Protect = On (disables writing).
Write Protect = Off (enables writing – default).
Remote LED Connector*
Pin 5 (top pin in this illustration) is negative,
Pin 6 (bottom pin) is positive.*
Reserved (RES)
Reserved for factory use.
*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.