So what do you mean by "secure format"?
Windows and PM8 will format the HDD good enough to prevent the majority of people fom regaining data from it.
If you want to make it impossible to recover data then the hard drive needs writing over with zeros several times (at least 7 passes for goverment use more for military).
File erasers :-
Eraser click here
Ultrawipe click here
SuperShredder click here
killdisk click here