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need a good windows application for zeroization

i am in the process of erasing emails from our server and local pcs, for legal reasons. i need a good tool for zeroization to permanently remove all traces of this data off the hard disk, while not affecting any aspect of the operating system.

i heard of a cipher.exe application that comes with the newer windows? does it work?, any proprietary software recommendations are also warmly welcome.

Correct me if i am wrong, but i thought i heard something like you have to run these zeroization processes several cycles to fully erase all traces. is this correct??
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CiaranDe
Asked:
CiaranDe
3 Solutions
 
TolomirAdministratorCommented:
You can give the free ccleaner a try. Choose to wipe free space.

www.ccleaner.com With this setting you clean free space with DoD standard.


Of cause you have to delete those email files before.


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TolomirAdministratorCommented:
you can check with an undelete tool afterwards.

http://www.piriform.com/recuva

It should get you no results...
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wingkchanCommented:
We used the Eraser.  It's a free open source app that permanently deletes data from your computer, while running in windows.  You can right click a file or folder, choose eraser to delete it (or schedule it to run at other time).  I see that it has different erasing standard to choose from.

http://eraser.heidi.ie/index.php
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dbruntonCommented:
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dbruntonCommented:
Correction.  Dban is not a Windows application as requested.
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Dave BaldwinFixer of ProblemsCommented:
There are numerous standards and this article lists some of them: http://en.wikipedia.org/wiki/Data_erasure  Note that erasing a file any number of times has no effect on any remnants of a temporary copy of it.  The temp copy won't even have a directory entry so that you could 'easily' find it.  Forensic software can read a disk sector by sector though and find anything that can be identified.  That's probably why data erasure for security purposes focuses on erasing the entire disk.

That link by @Tolomir may be just what you need though.  Make sure you use that After you delete the file.  And be careful with CCleaner, it is a powerful program.
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