Seagate ST39173N/W/WD/LW/WC/LC manual WD drives, Terminating the drive W model shown

48		Barracuda 9LP Installation Guide, Rev. E
	W/WD drives

Terminating the drive

“W” model drives are terminated with permanently mounted IC active terminators. If you install one of these drives and it is not on the end of the SCSI bus, disable the terminators by removing the jumper “TE” from pins 15 and 16 of connector J2. If you install the drive on the end of the SCSI bus, enable termination by installing a jumper on pins 15 and 16 of connector J2 (see Figure 13).

Note. Use active (ANSI SCSI-2 Alternative 2) terminators when terminating the bus.

“WD” and “LW” model drives do not have internal terminators or any other way of adding internal termination to the drive. You must provide external differential termination to these drives when termination is required.

Pin 1

J2	R
[1]	T D M W P E T T
	E S E P D S P P

*Enable SCSI terminator

*Disable SCSI terminator

*“W” model only

(default)

J2 Jumper Plug

(enlarged to show detail)

J2

J6

Drive

Front

[1] The “TE” jumper is not applicable to “WD” and “LW” drives.

Figure 13. Terminating the drive (“W” model shown)