If there are viruses or suspicious files that cannot be found, or if the data on the USB drive is lost but the capacity still shows that there is something, then you can set it as shown in the figure:
The steps to set it up are: Open My Computer —— Tools —— Folder Options —— View.
[Uncheck] Hide protected operating system files (recommended)
[Check] Show all files
[Uncheck] Hide extensions for known file types. (After unchecking this option, be careful when renaming files. Do not change what comes after the period (.), otherwise, the file may not open.)