Seagate ST9051A, Installation Manual

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Caution. Improperly plugging the connector may damage the
drive. To prevent damage, the mating cable connector should be
keyed by blocking the hole for Pin-20.
Master/Slave
Configuration Jumpers
PCB
Pin 1
Key - Pin 20 (Removed)
A C
B D
Drive is Master, no Slave drive present
Drive is Master, Seagate Slave drive present
Drive is Slave to another ST9144 Family Master
Reserved Positions (Do Not Use)
Note: The drive is shown
with the PC Board up.
Notch
For ST9051A and
ST9077A Only:
A notch here
indicates the drive
has metric screw
threads, thread
size: M3x0.5
Figure 1: ST9144 family AT drive setup
ST9144 Family Installation Guide, Rev. B 9