Each computer has one or several USB ports. And it is unified and common to each other. This can facilitate the majority of users. but. The unified port also has disadvantages, and the information is easily copied by others. To prevent such incidents. May wish to do simple physical processing to your computer USB port.
There are four lines in the USB port. They are power supply positive, data positive, data negative, and power negative. The power supply part cannot be changed. Otherwise it will damage the external storage device. However, the exchange of data lines does not affect the external storage device. therefore. When your computer has a secret, and you don't want other mobile storage devices to copy privately, you can manually cross the data lines inside. The data lines in the corresponding USB lines are also transposed. When you use it yourself. Use the transposed USB cable. When not in use. Cannot work due to the transposition of the USB cable in the computer. This is equivalent to adding a lock to your computer.
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