Re: FileCopy overwrites the existing file

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anton bassov wrote:
So I can't just say "I don't believe it is possible" or better take Anton's approach:
"My software works: prove me that I'm wrong".

Could you please provide a quotation in order to back up the above
statement - otherwise, this is just libel....

You did emphasize few times in this thread that "no one ever *DEMONSTARATED* how to do it" (recover erased data) and used it as a main argument. If any data erasing software author used the same reasoning this would be an equivalent to "My software works: prove me that I'm wrong" attitude.



By selling the software and ensuring your customers the
data is really destroyed and not to be recovered (or at least by giving
very high probability of that, like 99.9999%), you put your reputation
with your words.

It would be unwise to guarantee anything. More on this below:

I would really like to have such confidence,
overwriting large file is quite expensive and if I had to do it, say 5
times instead of once it will take 5 times as long.
Btw, I've seen a software that allows a user to overwrite the sectors up
to 100 hundred times!

And still there is no 100% guarantee....

Yes, but as I mentioned I can estimate a probability of data being not destroyed, and if it is very low (near 0 and probability of data destruction 99.99..) then this enough for the vast majority of users. Especially that better alternatives would be much more inconvienient to use, starting from multiple erasing of entire unused space, trough techniques that would require detaching the hardrive, to the ultimate solutions that would result in physical destruction of the drive.
--
Grzegorz Wróbel
http://www.4neurons.com/
677265676F727940346E6575726F6E732E636F6D
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