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40 Pin  
Hard  
Drive
Pin
Signal
Pin
Signal
1
Reset
21
DMARQ
2
Ground
22
Ground
3
Data 7
23
DIOW-
4
Data 8
24
Ground
5
Data 6
25
DIOR-
6
Data 9
26
Ground
7
Data 5
27
IORDY
8
Data 10
28
CSEL
9
Data 4
29
DMARK-
10
Data 11
30
Ground
11
Data 3
31
INTRQ
12
Data 12
32
IOCS16
13
Data 2
33
DA1
14
Data 13
34
PDIAG-
15
Data 1
35
DA0
16
Data 14
36
DA2
17
Data 0
37
CS1FX-
18
Data 15
38
CS3FX-
19
Ground
39
DASP-
20
Key
40
Ground
Pin 1 is usually marked
in Red (on the cable)
SATA Data
Connector
Pin
Signal
1
Ground
2
A+
3
A-
4
Ground
5
B-
6
B+
7
Ground

Serial ATA (SATA) Power

Pin
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34

Floppy Drive Interface Cable

Pin
Signal
1
+3.3 VDC
2
+3.3 VDC
3
+3.3 VDC
4
COM
5
COM
6
COM
7
+5 VDC
8
+5 VDC
9
+5 VDC
10
COM
11
COM
12
COM
13
+12 VDC
14
+12 VDC
15
+12 VDC
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