how to erase data so that no one can recovered it

HOW TO ERASE DATA SO THAT NO ONE CAN CAN RECOVERED IT

Many Files can be recover through recovery tools.but if you don't want your files to be recovered,you can use  a tools calls
Download C Cleaner's here
C Cleaner is a software that use utility to automatically wipes your hard drive's free space by writting other data over the
free space on your hard drive and all deleted files will be erased.For example,CCleaner's integrated Drive Wiper tool.
  METHOD TO ERASE DATA SO NO ONE CAN RECOVER IT
You can use a "file-shredding" application such as Eraser to delete it.When a file is shredded or erased,not only is it deleted,but its data is overwritten entirely,preventing other people from recovering it.

To really prevent someone from recovering any of your data,you can use a disk-wiping program,such as DBAN(Darik's Boot Nuke)Burn DBAN to a CD,boot from it,and it will erase everything from your hard drive,including your operating system and all personal files,overwritting them with useless data.

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