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Cheetah 9 Installation Guide, Rev. B
Other applicable jumper options
Other option jumpers are available as illustrated below.
Reserved
Delay Motor Start option
(valid only if the Enable Motor Start jumper is not connected)
Disable the Delay Motor Start option (default).
Motor start delay equal to the SCSI ID multiplied by 12 seconds.
For example, if the SCSI ID = 2, the drive starts in 24 seconds.
Motor Start option
Disable motor start (default). The drive starts according to the
Delay Motor Start option.
Enable motor start. The drive waits for the Start Unit command
from the host before starting the spindle motor.
Write Protect option
Write protect = Off (enables writing – default).
Write protect = On (disables writing).
Parity Check option
Enable parity check of SCSI bus (default).
Disable parity check.
Figure 15. Additional jumper options
Drive
J2 Jumper
Front
(enlarged to
show detail)
J2
T
E
J2
J6
DC Power
Connector
W/WD drives
Pin 1
Pin 2
R
T
T
D
M
W
P
E
P
P
S
E
P
D
S
2
1
Pin 1
SCSI I/O
J1
Connector
47
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