Ubuntu Basics DELETE UNDELETE TRASH ON USB DRIVES
Files deleted on USB flash drives are not sent to the "trash bin". They are not visible on the USB, but are (in some sense) still there. If you right click and go to properties you will see in the pie chart that those deleted files still take up space on the flash drive. To get rid of them completely, you must Ctrl-H to see the .trash file. Ctrl-H makes hidden files visible and hidden files begin with a dot. If you select the dot file, right click it, and select "send to trash" (for the second time) the file will be "taken away to the city dump" (so to speak). Now, the pie chart shows that no space is being used on the flash drive. This method of deleting files is sort of a safety feature. It is possible to recover deleted files, but this video tutorial does not show the method.