Case:
A U disk of the customer is connected to the computer indicator long, read and write data.
Solution:
The indicator light that does not recognize the disk U disk has been bright, indicating that there is no problem with the power supply and crystal. It is judged that there is a problem with the driving chip. Use an same driver to replace it with it.It was exactly the same, and then changed it, this time it was fine, all the data returned.