These card readers normally fit the auxiliary USB socket on the motherboard. They usually take up all nine pins, four on one row and five on the other with a 10 socket plug. One pin missing on the end of a row.Such card readers have an additional external USB port as well as card reader slots. If it is just a straight five pin plug but with four wires it just fits over one side of the nine pin USB socket on the motherboard. The black wire goes at the end with the missing pin.
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Need more info. What brand and model is the old and new card readers. Usually the instructions will tell you what each wire is for, you may have to match the wires to what the motherboard manual says they are.
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