DeleteUnused
------------

This program is intended to be used in conjunction with "SecureDelete" to securely remove any data that might be left behind on your disk in its "unused" sectors (ie. sectors that are not used by existing files).

This is to guard against the possibility that someone with a disk editor might view your unused sectors and recover the contents of files that were previously there.

It does this by opening a file whose name you choose (the name isn't important), and then writes to it continuously until the disk fills up. It then writes another six passes of data (first pass, all one bits, other passes random data), to make sure the data can't be recovered. It then deletes this file, to free up the disk space again.


PRECAUTIONS
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Before running this program:

1. Delete any unwanted files, particularly "backup" files (eg. xxx.BAK) which contain sensitive data.

2. Empty your "recycle bin".

3. Make sure other programs are not running - if the disk fills up they may get excited.

4. If you have more than one logical drive (eg. C, D, E) then you will need to run this program on each drive. It will only fill up the drive that it is running on.

5. After using this program, delete any further files that contain confidential information with "SecureDelete" (if they are no longer wanted, of course!)

6. You can press Ctrl+C to abort the operation, and the program will delete (ie. remove from the disk directory) your nominated file. However if the program is aborted before finishing normally then the disk is not as secure as if it had.

USAGE
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On the command line, specify the name of the file you want created. It will default to \UNUSED.DAT


 eg. deleteunused c:\temp.dat
     deleteunused d:\blahblah.dat

Warning - the more free disk space you have, the longer the program will take to run.


DISCLAIMER
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The author does not accept responsibility for any problems caused by this program. Use it with care.


SUMMARY
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Author: Nick Gammon <nick@gammon.com.au>

Web: http://www.gammon.com.au

Date: 28th May 1998

Usage: deleteunused <filename>
       deleteunused /help <---- shows help information

eg. deleteunused d:\temp.dat


Copyright 1998 by Nick Gammon - Gammon Software Solutions.

This program may be freely distributed provided credit is given to the author. It may not be commercially distributed (ie. for a fee) without a written arrangement with the author.
