How to wipe my HDD?

Say i want to sell my PC, how do i get rid of everything to make it like the first day i bought it?
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More about wipe
  1. Use system restore , either built in or recovery discs...
  2. if you want to sell it you really need to totally securely erase the hard drive not just reload windows

    have bought plenty off ebay and even with windows reloaded using restore or recovery

    files could still be recovered

    use something like boot and nuke and overwrite it to at least DOD level

    then reload windows

    this takes time but its the way to be sure nothing can be recovered from it
  3. most drive maker have a free tool to do a full format of the drive writting 0 and 1 on it and after that reinstall the os with the user name unknown as admin.
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