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permanently delete the data

i have formated my windows 7 laptop and installed new o.s. when i try to recovered my formatted  files all files are successfully recoverd.
i want to format in such a way that no one should recovery my files. can any one have the solution for it.

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mshakeb
Asked:
mshakeb
4 Solutions
 
*** Hopeleonie ***IT ManagerCommented:
Use Darik's Boot and Nuke ("DBAN") to format. The easiest option is to type autonuke.
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techdunesCommented:
Use the below software, its free for personal use. It uses Low level format which makes recovery almost impossible.HDD LLF Low Level Format Tool
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d_nedelchevCommented:
Also if you whant to erase files when you have already reinstalled an OS you can use CCleaner (from http://www.piriform.com/ccleaner/download/standard ) -> Tools -> Drive Wiper -> Wipe: Free space only. It supports different erase algorithms used by US government agencies.
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jcimarronCommented:
mshakeb--This tutorial will help you use DBAN
http://www.security.ku.edu/download/DBAN_Tutorial.pdf
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mshakebAuthor Commented:
i did low level formatting. it was sucessfully deleted the data parmamently
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