If I format all my drivers c,d,e,f and then make a truecrypt volumes equal to drive size then delete it 'the voulme' will that make the old data unrecoverable ex. d:= 30g i use truecrypt to make 30g volume on d then delete it. and at the end do the same on the free space at for windows drive c:
how secure this way, i dont want to use any programs as I dont trust it any way so I want to do it manual
Edit: I'll do all this before selling it, so no one would recover my personal stuff.