Seagate BARRACUDA ST11950N/ND/W/WD - Manual (Page 36)

34 ST11950 and ST12550 Installation Guide, Rev. D
Figure 13 illustrates a typical synchronized spindle
configuration.
After connecting each drive with spindle sync cables,
you must designate a master spindle sync reference
source. This master source is normally a disc drive
located on the same SCSI bus as the other drives you
want to synchronize with. To designate a drive as the
master, use SCSI interface commands. Refer to the
Product Manual for information about using these
commands.
Master Sync
Source
Host
(or other drive)
Spindle
Control
Drive 1
+5V
RT
J4
1
2
Spindle
Control
Drive 2
+5V
RT
J4
1
2
Spindle
Control
Drive n
+5V
RT
J4
1
2
Sync Interface
System
Interface
Master Sync
Source
Host
(or other drive)
Spindle
Control
Drive 1
+5V
RT
J5
11
12
Spindle
Control
Drive 2
+5V
RT
J5
11
12
Spindle
Control
Drive n
+5V
RT
J5
11
12
Sync Interface
System
Interface
ST11950N/ND and
ST12550N/ND Drives
ST11950W/WD and
ST12550W/WD Drives
Figure 13. Spindle sync diagram