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Barracuda 180 Product Manual, Rev. A 37
8.1.2 Function description
J2
jumper
installation Jumper function description
SE
On Forces drive to use single-ended I/O drivers/receivers only.
Off Drive can operate on the interface in low voltage differential mode or single-ended, depend-
ing on the voltage state of the I/O “DIFFSNS” line.
Default
is SE jumper not installed.
DS ME
Off
Off Spindle starts immediately after power up -
Default
setting.
Off On Drive spindle does not start until Start Unit command received from host.
On Off Spindle Startup is delayed by SCSI ID times 12 seconds after power is applied, i.e., drive 0
spindle starts immediately when DC power connected, drive 1 starts after 12 second delay,
drive 2 starts after 24 second delay, etc.
On On Drive spindle starts when Start Unit command received from host. Delayed start feature is
overridden and does not apply when
ME
jumper is installed.
WP
On Entire drive is write protected.
Off
Drive is not write protected.
Default
is
WP
jumper not installed.
PD
On Parity checking and parity error reporting by the drive is disabled.
Off
Drive checks for parity and reports result of parity checking to host.
Default
is
PD
jumper not installed.
RES
Off
Reserved jumper position.
Default
is no
RES
jumper installed.
TP1 (Does not apply to the LC/LCV models)
Off The drive does not supply terminator power to external terminators or to the SCSI bus I/O
cable.
On Drive supplies power to SCSI bus I/O cable. When drives have differential I/O circuits, a
jumper on the
TP1
position may be needed to power external terminators (see system docu-
mentation). These drives do not have terminator circuits on the drive.