44-pin connectors are mainly used in 2.5-inch PATA (IDE) hard drives for notebooks. They have the same pin assignment as the standard 40-pin PATA (IDE) connectors but there are 4 additional four pins (41 to 44) used for power supply. Another difference is that the spacing between pins is smaller due to the smaller drive size, which means that both interfaces are electrically, but not physically compatible. Therefore if you want to connect 44-pin drive to a 40-pin connector you will need a special adapter.

2.5 inch hard drives also have jumpers like their desktop counterparts but they are very rarely used, as in mobile computers hard drives are almost always configured to work as Master devices.

Pin Signal 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
21 n/c Not connected
22 GND Ground
23 /IOW Write Strobe
24 GND Ground
25 /IOR Read Strobe
26 GND Ground
27 IO_CH_RDY
28 ALE Address Latch Enable
29 n/c Not connected
30 GND Ground
31 IRQR Interrupt Request
32 /IOCS16 IO ChipSelect 16
33 DA1 Address 1
34 n/c Not connected
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)