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Advanced Technology Attachment (ATA), interface and pinouts  for the 2.5" ide laptop drives

For Standard 40 pin system see

For the 50 pin laptop standard see:

This connector is mostly used for 2.5 IDE HDD of notebooks and so on. See ATA pinout for pins 1-40.

44 pin IDC (0.75") male connector layout

44 pin IDC (0.75") male connector  at the controller & peripherals

44 pin IDC (0.75") female connector diagram

44 pin IDC (0.75") female connector  at the cable

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
29 /DMACK ? DMA Acknowledge
30 GND --- Ground
31 INTRQ <-- Interrupt Request
32 /IOCS16 ? IO ChipSelect 16
33 DA1 --> Address 1
34 PDIAG ? Passed Diagnostics
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 (hard disks)

ATA (50) internal pinout

mostly used for 2.5 IDE HDD of laptops and some other device. Equal to ATA (44) connector, except 50 pin connector used.

50 pin IDC male connector layout

50 pin IDC male connector  at the controller & peripherals

There are 50 pins in the plug, the mating receptacle need contain only 44 pins (the removal of pins 45 and 46 provides room for the wall of the receptacle).

The last four pins of the connector plug located on the device are not to be connected to the host, as they are reserved for manufacturer's use. Pins 45, 46 and 20 are keys, and are removed.

Pin Name Dir Description
41 +5VL --> +5 VDC (Logic)
42 +5VM --> +5 VDC (Motor)
43 GND --- Ground
44 /TYPE --> Type (0=ATA)
45     Vendor specific
46     Vendor specific
47     Vendor specific
48     Vendor specific
49     Vendor specific
50     Vendor specific

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address and contact numbers from 11th feb 2008

Tel: 0121 622 1217

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address and contact numbers from 11th feb 2008

Tel: 0121 622 1217

Fax: 0121 622 6999

Sparesweb.com ltd
Unit 107 Jubilee Trade centre
Pershore street
Birmingham
B5 6ND

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Last modified: 11/08/05

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