Our Panasonic had some HD issues last year. First it would not record, a msg. on screen said drive was full. Then it would not play, a msg. on screen said nothing recorded! So, local friendly dealer reformatted it for us and all was back to normal. Now it has started to freeze momentarily during play backs. You can just about live with it for most programmes, but not music etc. I'm thinking of opening the black box and changing the HDD for new as I expect it will be a simple plug in module. The question is, has anybody done it, and more importantly, were they successful? Thanks for any feedback.