I/O Cable And Connector; Power Connector; Figure 2. Ata Interface Connector - Seagate Medalist 1270 Product Manual

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2.2 I/O cable and connector

The drive uses a 40-pin, male I/O connector with two rows of twenty pins
each and a notch for keying. Pin 20 is removed for keying purposes. A
drawing of the I/O connector is shown in Figure 2. Pin 1 is located near
the 4-pin power connector when the I/O connector is mounted.
0.70 ± 0.010
0.025
± 0.002
0.160
1.90
2.00

Figure 2. ATA interface connector

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)
To ensure the integrity of your data, use a 40-connector, nonshielded I/O
cable with a maximum length of 18 inches (46 centimeters).

2.3 Power connector

The drive uses a standard 4-pin, male power connector. We recommend
the following part number or their equivalents for the mating connector.
Part Description
Connector Housing
Connector Pin (loose piece)
Connector Pin (Reel)
Cable 18 AWG
Medalist 1270 Product Manual, August 1995
0.100 ± 0.010
0.230 ± 0.003
0.235 ± 0.025
0.025 ± 0.002
pin 1
0.100 typ
3M part number
3M-3417-7000
3M-3448-2040
3M-3365-40
Part number
AMP 1-480424-0
AMP 60619-4
AMP 6117-4
0.070 ± 0.010