The sweep sensor, where you run your finger down the sensor as opposed to just placing it on a square sensor, is making headway. It’s already appearing on cell phones, and now USB drives. The advantages of the sweep sensor include a lower cost and less space requirements (great for portable devices). If you have a larger finger, then it also makes it easier to obtain a full image. However, there is room for more user error as the training for this type of sensor is a little more intense than just learning how to place a finger on a square.
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