This connector is 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 at the controller & peripherals
Although 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.
Note: Direction is Controller relative Devices (harddisks).
50 pin IDC female connector at the cable