I have a question and I don't know where to find the answer. What I need here is someone who knows all there is to know about videotape technology.
Here's the question. When you reuse a tape, is the previous recording always erased completely? Are there any circumstances, ever, where a previous image might show as a faint overlay on the new recording? Or is it an absolute that the previous recording is definitely gone for ever, and no trace of it could remain?
It's an important matter to me, because it would mean that every investigation would need a fresh tape. No re-use. Expensive, but if it's necessary, I'll do it. Or maybe I could dump all the tape-driven cameras and use hard-disk ones instead. They can't have this problem. Or can they? What about those solid-state ones that use memory cards? Surely reformatting the disk or the card would clean everything off it?