uzamitprofessional :
I need to complete wipe out my hard drive so no any data could be recovered even by the computer hardware specialists. Also thanks in advance.
Possible, yes. Easy & fast, no.
Basically, you want an app that will not only delete the reference to the files, but will also write "junk" data (i.e. all 0s, all 1s, etc.) to every sector on the drive...& make sure that it will do that multiple times.
Even with that, though, if you really want the data to not be recoverable, you'll still want to take a really strong magnet & swipe it across the platters multiple times. Or, better yet, take a drill & put a few holes all the way through the HDD enclosure.