What are the codes to change the usb font colours?i mean the colour of the files's name?

On a Mac, this is quite easy.  If you are looking to
highlight the file's name in different colors for recognition purposes, you will have to
make sure you know on which file you wish to change color.  Click on the file, so that
it "looks" different from the rest of the screen and to indicate that this is the file
you wish to change.  On my screen, the highlighted file will appear in a darker color
blue surrounding the font.  While it is highlighted, proceed to "File" and click on it.
 You should see a drop down screen.  Go to "Label" and then there is a selection of
colors, an array from which you can choose to highlight the font of the file in
question.  At this point, the file should be a different color from all else. I am not
entirely familiar with how this is going to work on a PC, but I have attached a link
that discussed how to color code all your files, the color surrounding the font, on
Windows, which should help out a bit.