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Make deleted file unrecoverable by undelete software

August 11, 2005 22:15 by Sze Hau 1 Comment

How do you make sure your deleted sensitive documents are really deleted? Drag it into recycle bin and empty it? Use ‘del’ in windows command prompt or ‘rm’ in linux?

There are many software nowaday can undelete the ‘deleted’ files. When you delete a file, the system actually delete the file header and remove the pointer to the file in the system’s file index. Therefore tThose undelete software can easily find deleted files by simply search your harddisk for unpointered files.

There are two ways to make the files unrecoverable:

  1. Use low level format to format your harddrive (but no point to do this)
  2. Write a simple program that open the file, write junk data (until it exceed the original file size) to the file and then delete it.

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Filed Under: programming

About Sze Hau

Geek. Love programming. Coffee addicted. Married with a child. Working towards financial freedom.

Comments

  1. EngLee says

    August 12, 2005 01:14 at 1:14 am

    Dude, what kind of secret do you have that you are so afraid of somebody else found it? LOL!

    Reply

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szehau’s weblog

szehau is a software programmer that has strong interest in the world of programming and Internet. He is graduated in University of Malaya, Malaysia with a Bachelor’s degree in Software Engineering. He draws on his passsion for web programming to share with others how to build a successful websites.

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