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Delete a file and will it forever gone?

Hi ,

How do we delete a file and make sure it will be gone forever & even those recovery software cant retrive it.

I have done a lot of recovery for my client using various software and was thinking of the question, can a file be delete & gone forever?

Please Advice.

Regards
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mysticaljoey
Asked:
mysticaljoey
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1 Solution
 
Lee W, MVPTechnology and Business Process AdvisorCommented:
Not if it's TOP SECRET and in the US Government.  as I understand it, they never get rid of the "TOP SECRET" stuff, even when they wipe drives a seemingly endless number of times.

For all practical purposes, a file shredder program should be able to do the trick, deleting the file then rewriting data to it's previous location.
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Lee W, MVPTechnology and Business Process AdvisorCommented:
Mind you, I've never used one, but Spybot has a shredder built in.
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Rich RumbleSecurity SamuraiCommented:
Sorry, physically damaging the platters is the ONLY way. Shredders/wipers, none of them work well enough- I've tested them all I swear to you I have. Formatting, wiping, deleting, overwritting- doesn't matter, depending on the amount you are willing to spend to recover data, it can be recovered. Free recovery programs do an ok job, but programs that are paid for  do a much better job. We bought on-track and it's paid for itself over and over... it's one of the best if not the best. If you want the best, it's an electron tunneling microscope, it can see every bit ever set on a HD platter, but no one actually goes to those lengths to find data, maybe the NSA or DOD, but no one else...
We recover data daily with on-track, and if we hadn't run the test's for ourselves, we never would of spent the kind of cash we did:
http://www.ontrack.com/easyrecoveryprofessional/
http://www.sciencenews.org/articles/20000708/fob1.asp
http://slashdot.org/askslashdot/01/02/21/1752256.shtml

Even memory sticks have data that is recoverable long after erasure/deletion/overwritting
-rich
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mysticaljoeyAuthor Commented:
Another question,

Let say if i run all my data  on my pendrive, usb external hard drive or internet drive can the recovery solfware still retrieve the data on the pc ?
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Rich RumbleSecurity SamuraiCommented:
If someone has physical access to those devices, yes data is recoverable from NV-Ram (even vram)devices (usb memory sticks, etc) as well as any form of HD. Here is a paper detailing why this is possible: http://www.cs.auckland.ac.nz/~pgut001/pubs/secure_del.html log read, but very good.
-rich
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mysticaljoeyAuthor Commented:
-Rich

What i mean was, if i access data from pen drive on computer "a" and keep the pen drive  away secure, would it leave any trace on the computer "a"

Regards
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Rich RumbleSecurity SamuraiCommented:
not unless you copied any of the data from the pendrive to the harddrive of the machine, the only possible traces might be in the pagefile of the machine, or in temp files. Also when you delete from a drive physically connected to a pc, typically those files are placed in the recycle bin, so there could be traces there if you did that. Otherwise no, there should be no trace.
-rich
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