Barracuda 4 Installation Guide, Rev. E | 39 |
Other applicable jumper options
Several other jumper options are available as illustrated.
SCSI
Connector
DC Power
Connector
Reserved (RES)
Pin 1 |
J4 |
J4 
RES MTR WP RES
PAR DMS LED
drivesN/ND
Reserved for future use.
Parity Check option (PAR)
Enable parity check of SCSI bus data (default).
Disable parity check.
Motor Start option (MTR)
Enable motor start. The drive waits for the Start Unit command from the host before starting the spindle motor.
Disable motor start (default). The drive starts according to the
Delay Motor Start option setting as described below.
Delay Motor Start option (DMS)
(valid only if the Motor Start jumper is not connected)
Motor start delay equal to the SCSI ID multiplied by 10 seconds.
For example, if the SCSI ID=2, the drive starts in 20 seconds.
Disable the delay motor start option (default).
Write Protect option (WP)
Write Protect = On (disables writing).
Write Protect = Off (enables writing – default).
Remote LED Connector*
Pin 5 (top pin) is negative (cathode), Pin 6 (bottom pin) is positive (anode).
*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.
