I/O Cable And Connector; Figure 2. At Interface Connector - Seagate ST3780A Product Manual

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2.2 I/O cable and connector

The I/O connector is a 40-pin connector. The even pins are next to the
edge of the printed circuit board; the odd pins are away from the printed
circuit board. Pin 1 is near the 4-pin power connector. The I/O connector
is shown in Figure 2.
There is no pin 20 because that location is used as a key. Make sure the
corresponding pin hole on the cable connector is plugged to prevent the
connector from being installed upside down. The I/O cable cannot be
longer than 18 inches (0.46 meters).
The table below lists recommended parts for the mating connector. You
can use equivalent parts.
Part Description
Connector 40-pin
Connector 40-pin
Flat cable AWG28 (stranded)
0.70 ± 0.010
0.025
± 0.002
0.160
1.90
2.00

Figure 2. AT interface connector

Medalist Family AT Product Manual, Rev. A
3M part number
3M-3417-7000
3M-3448-2040
3M-3365-40
0.100 ± 0.010
0.230 ± 0.003
0.235 ± 0.025
0.025 ± 0.002
pin 1
0.100 typ
0.070 ± 0.010