What basically happens when you initially "delete" a file, is that you are telling the computer's MBR or master boot record, to "forget" where this file is. There are only 2 generally accepted ways to delete a file permanently.Either by using an erasing program (popular with companies who want to make sure sensitive documents/files are properly deleted, or by the file itself being overwritten(in essence another file's data was written over it)
Other than using a file cleaning program, pretty much anyone with some tech savvy can recover accidentally deleted files.
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"It is not that I have failed, but that I have found 10,000 ways that it DOESN'T work!" --Thomas Edison
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