Finally saw it! - Now Just the Ring.

[Carol]

Carol earlier:
> But if the Horcrux is destroyed, so is the soul bit, so there *is* no "residual stuff." In both the film and the book, Dumbledore can safely put on the ring. That means either Snape removed the curse and DD destroyed the soul bit (book) or DD destroyed the soul bit, which somehow injured his hand without the aid of any additional curse (and Snape gets stripped of credit for saving DD's life). 
> 
> 
> Robin:
> Carol I think you're right, however the bit of LV that was in H had to recognize the ring and it's importance.  Even if DD destroyed the horcrux while becoming injured by the curse placed upon it, that bit of LV still must retain LV's memories.  If not, then how can LV continue to exist in the physical plane?  That bit has to act, in some way, like a back-up disc of LV.

Carol responds:
Possibly, that's what the movie makers had in mind. However, neither Book!Harry nor his soul bit recognizes the ring when DD wears it at Slughorn's (temporary Muggle) house or when he sees it in the Pensieve visit to the Gaunts' hovel. And when he sees it again, he recognizes it only as Marvolo's ring, at which point DD tells him about the curse from which he was saved by Snape's "timely action" and about destroying the Horcrux, which we later find out he did with the Sword of Gryffindor.

So, anyway, in the book there's no "back-up disc" and no trace of magic.

I'm not sure what you mean about LV continuing to exist in the physical plane. The last part of his soul, what we might consider to be the "main soul," is in him but can exist even without a body as long as he has at least one Horcrux, including the accidental Horcrux in Harry's scar.

Carol, who needs to go make lunch now!