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Whenever U-disk is used, people always pick it up and fit it to the computer. However, it is always a problem to distinguish the positive and negative of it. More people use it like flipping a coin. They think that there is always a half probability of successfully inserting it into the computer. What's more amazing is that some people do not fit it correctly until the third time. In fact, technology products are used to facilitate life, so the U-disk is no exception. We make a groove design on the front of the U-disk that fits the outline of the thumb. When we use the U-disk again, we can clearly distinguish its front and back.