Seagate ST39251LC User Manual download pdf (Page 33)

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jumper

installation Jumper function description

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, depending on the voltage state of the I/O “DIFFSNS” line.

Default is SE jumper not installed.

Off

Spindle starts immediately after power up - Default setting.

Off

Drive spindle does not start until Start Unit command received from

host.

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.

Drive spindle starts when Start Unit command received from host.

Delayed start feature is overridden and does not apply when ME jumper

is installed.

Entire drive is write protected.

Off

Drive is not write protected. Default is WP jumper not installed.

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.

Off

The drive does not supply terminator power to external terminators or to

the SCSI bus I/O cable.

Drive supplies power to SCSI bus I/O cable. When drives have differential

I/O circuits, a jumper on the TP position may be needed to power

external terminators (see system documentation).

These drives do not have terminator circuits on the drive.

Note. J2 does not exist on LC models and is supported on LW models only.

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Seagate ST39251LC User Manual Page 33