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Barracuda 4 Installation Guide, Rev. E 39
Other applicable jumper options
Several other jumper options are available as illustrated.
Figure 14. Additional jumper options
Write Protect = On (disables writing).
Write Protect = Off (enables writing – default).
J4
RES
WP
LED
Write Protect option (WP)
Reserved for future use.
Reserved (RES)
SCSI
Connector
DC Power
Connector
J4
Pin 1
Pin 5 (top pin) is negative (cathode), Pin 6 (bottom pin)
is positive (anode).
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
Enable parity check of SCSI bus data (default).
PAR
MTR
DMS
Parity Check option (PAR)
Disable parity check.
Enable motor start. The drive waits for the Start Unit command
from the host before starting the spindle motor.
Motor Start option (MTR)
Disable motor start (default). The drive starts according to the
Delay Motor Start option setting as described below.
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.
Delay Motor Start option (DMS)
(valid only if the Motor Start jumper is not connected)
Disable the delay motor start option (default).
N/ND drives
N/ND drives