2016-08-05 13:36:02 Posted by Tracy King to Resource
Why need File/Folder Erase?
Most people have some data that they would rather not share with others - passwords, personal information, classified documents from work, financial records, self-written poems, the list can be continued forever.
Perhaps you have saved some of this information on your computer where it is conveniently at your reach, but when the time comes to remove the data from your hard disk, things get a bit more complicated and maintaining your privacy is not as simple as it may have seemed at first.
When a file is deleted in the computer, it is not really deleted. For speed performance reasons, the computer only deletes the file indexing information saying that the disk space the file occupied is now free. This means that the data contained in the file still exists, but it is no longer accessible and can be overwritten by new files. Only when another file is created that occupies the position of the old file in memory will that information disappear. This fact allows disk utilities like Data Recovery Wizard and the like to retrieve all or part of the information that the file contained. So it is possible, although unlikely, that someone will still be able to recover your sensitive information after it has been deleted.
To provide protection against this possibility, some file erase softwares overwrite the contents of a file with 2 complementary sequences of alternating bits, and then fills it with blank spaces prior to deleting it, thus completely erasing the contents of that file.
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