User's Manual

Additional tools
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When Delete allocated free space is selected, the Shredder will also delete the
free space that has been assigned to the files in Recycle Bin.
Click Next to confirm your selection.
Selecting the deletion method
This section deals with the level of security you wish to use when deleting files
or folders. Just select one of the three options in the Deletion method section.
Quick delete: Files will be overwritten with a single character The original text
of the files will be replaced with endless columns of a certain letter.
Secure delete in accordance with DoD 5220.22-M A procedure that was
developed by the United States Department of Defense (Regulation DoD
5220.22-M) will be used. The files are overwritten with special data patterns
multiple times before deletion, thereby destroying the original contents so
effectively that even expensive examinations of the magnetic structure of the
disk in a special laboratory cannot recover the data.
Secure delete, Gutmann method: This method, named after its inventor Peter
Gutmann, overwrites the files to be deleted 35 times with random values in a
special pattern and then deletes them. This method is considered the most secure
way to delete files with software, but also takes the longest time.
How securely do
you want to delete
your files?