Quote:
Originally Posted by jackastor
Sometimes there are faulty wiring in the usb cable. The wires may get broke and break the connection. Some of the wires are for power and some are just for data transfer. IF the data transfer wires are broken then the power will still flow but the computer will not see the reader. Use a different cable and see if the computer recognizes the device.
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To add a bit. If the wires inside are damaged, the connection will be noisy. A noisy connection for power won't disrupt chargng. A noisy connection for data will result in corrupt data. If the "handshake" on connection is corrupt, the device will not be recognized.