Seagate ST11200N Product Manual page 24

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Each drive can be configured for the non-synchronized mode in which it ignores any reference signal that
might be present. The connection of the synchronized reference signal to the host is required only if the host
is to provide the reference signal. If the host does not provide the reference signal, the host should not be
connected and the master should be drive #1. See Figure 5.7-1.
Master Sync
Source
(or other drive)
Notes:
[1] Configuration Select Header: (see Figure 10.1-1 and 10.2.1-1).
[2] This connection is only available on the "NC" models
Figure 5.7-1. Synchronized drive interconnect diagram
Product Manual - Hawk 1 Family SCSI-2 (Volume 1), Rev. D
Host
J1
SCSI Bus
System
Interface
J1
J1
Sync Interface
Spindle
Control
37
[2]
+5V
R
T
Drive 1
Spindle
Control
37
[2]
+5V
R
T
Drive 2
Spindle
Control
37
[2]
+5V
R
T
Drive n
REFIND +
J6
6
5
[1]
J6
6
5
[1]
J6
6
5
[1]