Image by openfly via Flickr
Some people might think that if they delete their sensitive files from their computers then those files cannot anymore be accessed by anyone. The common misconception is that files, once deleted, are permanently gone. This is not the fact. In reality, there are even some software products which are created particularly for the purpose of recovering those deleted files. The reason why deleted files can still be recovered is that the operating system does not actually remove the file physically from the hard disk. It merely marks those files as deleted and ready to be overwritten if necessary.
That is good if you happen to accidentally delete an important file and want to recover it using the right product. The problem is that unauthorized persons can also do the same thing to your deleted files. And if those files contain financial data, credit card information or user names and passwords, then you are in big trouble. The solution to this is to use specialized software to not only delete files but overwrite them with random bits of data. This is equivalent to a paper shredder. This is the way to go if you do not want others to access important files that you want to delete.

