Shredding is the process of permanently erasing files and traces from
a user's machine. This is done by overwriting the files, so that they
cannot be recovered. StealthRay allows the user to choose between five
shredding levels: "3," "7," "10," "15,"
and "35." The numbers refer to the amount of times a file is
being overwritten. The default shredding level is "3."
