Pen drive or memory card show empty even when data exists

Check if the files are not in hidden mode.

Click on "Start" -->Run --> Type cmd and press Enter.

Here I assume your pendrive drive letter as G:

Enter this command.

attrib -h -r -s /s /d g:\*.* --> Press Enter

You can copy the above command --> Right-click in the Command Prompt and

paste it.

Note : Replace the letter g with your pen drive letter.

Now check your pen drive for the files.