Seagate ST12550N/ND/W/WD, ST11950N/ND/W/WD manual J5 Pin

ST11950 and ST12550 Installation Guide, Rev. D 33

For W- and WD-type drives, use pins 11 and 12 on the J5 connector to attach the spindle sync cable. Pin 11 provides the reference index signal (REFSIG+) and pin 12 provides ground (GND). See Figure 12.

SCSI I/O	J5 Pin 1	DC Power
Connector		Connector
Spindle Sync Cable Connector (SSC)		SSC
These pins are used to connect a		J5
spindle sync cable.

Spindle sync reference index signal (REFSIG+).

Ground (GND).

Figure 12. Spindle sync jumpers and connectors

for ST11950W/WD and ST12550W/WD drives