Wipe free spce

After wipe free space is done, I try to recovery deleted it's still have everything. - -

So I try to recover some file, It's can recover but nothing include that file, It's null. OK I'm understood.

Now. If I want delete everything not except file name or anything, Can I do that?(except low level format. - -)

Thanks.

(Sory I not strong in English ^^)