Pinouts >  HDD and other storage devices connectors
44 pin IDC (2 mm pitch) female connector layout
44 pin IDC (2 mm pitch) female connector
at the cable
This connector is mostly used for 2.5 IDE HDD of notebooks and so on. Pins 1-40 are the same as the IDE/ATA 40 pin connector, but the spacing between pins is smaller and they are therefore electronically, but not physically compatible.
Pin Name Dir Description
1 /RESET --> Reset
2 GND --- Ground
3 DD7 <-> Data 7
4 DD8 <-> Data 8
5 DD6 <-> Data 6
6 DD9 <-> Data 9
7 DD5 <-> Data 5
8 DD10 <-> Data 10
9 DD4 <-> Data 4
10 DD11 <-> Data 11
11 DD3 <-> Data 3
12 DD12 <-> Data 12
13 DD2 <-> Data 2
14 DD13 <-> Data 13
15 DD1 <-> Data 1
16 DD14 <-> Data 14
17 DD0 <-> Data 0
18 DD15 <-> Data 15
19 GND --- Ground
20 KEY - Key (Pin missing)
21 DMARQ <-- DMA Request
22 GND --- Ground
23 /DIOW --> Write Strobe
24 GND --- Ground
25 /DIOR --> Read Strobe
26 GND --- Ground
27 IORDY <-- I/O Ready
28 SPSYNC:CSEL ? Spindle Sync or Cable Select. Hasn't been used for spindle sync in probably decades now.  It is grounded at the host; if a drive sees this pin grounded and has its CS jumper installed, it is the master/device 0, if it sees the pin floating and has its CS jumper installed, it is the slave/device 1.
29 /DMACK --> DMA Acknowledge
30 GND --- Ground
31 INTRQ <-- Interrupt Request
32 /IOCS16 <-- IO ChipSelect 16. During a PIO operation it signifies the data transaction in process needs to be a 16 bit value.  In DMA operations, it is never asserted, even though they are all 16 bit.
33 DA1 --> Address 1
34 PDIAG ? Passed Diagnostics. Is grounded by the cable when an 80 pin cable is installed, or wired through to the drives with a 40 pin cable
35 DA0 -- Address 0
36 DA2 -- Address 2
37 /IDE_CS0 --> (1F0-1F7)
38 /IDE_CS1 --> (3F6-3F7)
39 /ACTIVE --> Led driver
40 GND   Ground
41 +5VL   +5 VDC (Logic)
42 +5VM   +5 VDC (Motor)
43 GND   Ground
44 /TYPE   Type (0=ATA)

 

Note: Direction is Controller relative Devices (harddisks).

Special Note: Pin 1 is closest to the 4-pin selector. Pin 20 may be missing, this is normal, and allows for cable polarity.  

On some motherboards, pin 1 is usually indicated by a Square or Triangle, either on the solder pad, above label, or silkscreen markings.

Pinout status: +29 -7
According to 39 reports in our database (29 positive and 7 negative) the ATA (44) internal pinout should be correct.

Is this pinout
NO DIY devices
Source(s) of this and additional information: Hardware Book, Nick Schirmer
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