When you delete files using normal deletion methods, you leave all the information in those files readily available to anyone with access to your computer! File Monster, on the other hand, completely erases files from your system -- actually overwriting the information in the file. The reason your data is still available when you delete files with normal deletion methods is because the procedure only tells the operating system to not recognize the file as being present anymore; however, the data contained in those files hasn't truly been erased and anyone with a little knowledge of computers can very easily get the data back.
Often the first place someone that wants to retrieve information from your computer is going to look is at the information in the "deleted" files. After all, you just tipped them off that those files were important enough to you that you tried to erase them....
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