When deleting data with Index.dat analyzer, are there retrievable data traces left on hard drive?

December 31, 2013 at 02:04PM:

Used index.dat analyzer and it worked great. However, when using Index.dat analyzer, is the deleted data completely and permanently removed from the hard drive to the extent it cannot be recovered by forensic professionals? Is it overwritten automatically by this software.. or is there a way to to overwrite it (shred)?

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