How to lock a computer's USB port

Each computer has one or several USB ports. And it is unified and common to each other. This can facilitate the vast number of users. But. A unified port also has its drawbacks, and information is easily copied by others. To prevent this type of event from occurring. You may wish to do a simple physical processing of your computer's USB port.

There are four lines in the USB port. The power supply is positive, data positive, data negative, power supply negative. Where the power supply part is not changed. Otherwise, the external storage device will be damaged. However, the exchange of data lines does not affect the external storage device. So. When your computer has a secret, and do not want to other mobile storage devices privately copied, you can manually put the inside of the data line cross transposition. The data cable in the corresponding USB cable also crosses the position. When you use them. Use a transposition of the USB cable can be. Not when. Unable to work because the USB cable is swapped in the computer. This would be equivalent to adding a lock to your computer.