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:
- Use low level format to format your harddrive (but no point to do this)
- 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.