The card might contain temporary, hidden or system files generated by either the camera or computer. HyperDrive may not be able to see these files since they are system files and not meant to be seen by the user in the first place. You should not be too concerned about this unless you cannot find or see the files that you are expecting or if the hidden files are taking too much space. You can connect the HyperDrive to the computer via USB to see exactly what these hidden files are (be sure to enable your computer OS to see hidden files). It is also a good habit to format the memory card between every usage to clear any unwanted data.
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