Figure 26. St15150N/Nd Drives Configuration Select Header Specification; Figure 27. St15150W/Wd Drives Configuration Select Header Specification - Seagate ST15150N - Barracuda 4.3 GB Hard Drive Product Manual

56
10.2.1.2
10.2.1.3
ST15150N/ND/W/WD/WC/DC Product Manual, Rev. D
Termination
The reference index signal (SSREF ) is terminated with a 2.21K ohm
resistor. Each single-ended drive has a terminator resistor located on the
main PCB. The terminator resistor is not removable and is always in the
circuit. A diode prevents current from backfeeding.
Physical interface
Dimensions of the J04 (J4) connector mounted on the main PCB of
ST15150N/ND drives to interconnect the drives are shown in Figure 26. The
connector is a 22-pin, 11-position gold 2 mm header type. Only pins 1 and
2 are used for connecting the reference index signal cable, as shown in
Figure 20. Pin 1 is SSREF+ and pin 2 is ground.
.079
(2 mm)

Figure 26. ST15150N/ND drives configuration select header specification

Dimensions of the J5 connector mounted on the main PCB of ST15150W/WD
drives to interconnect the drives are shown in Figure 27. The connector is
a 12-pin, 6-position gold 2 mm header type connector. Only pins 11 and 12
are used for connecting the reference index signal cable, as shown in
Figure 22. Pin 11 is SSREF+ and pin 12 is ground.
.079
(2 mm)

Figure 27. ST15150W/WD drives configuration select header specification

.866
(22 mm)
.079 (2 mm)
J04
.787
(20 mm)
.520
(13.2 mm)
J5
.079
(2 mm)
Pin 1
.185
(4.7 mm)