Have been using Pana DMRHE50 for the last week and it's great. However, one problem has just arisen. Have dubbed material from HD to DVD -RW, and the program seems to have recorded alright, but then going through finalisation, it says "Finalise Failed". When I take the disc out and put it back in, it says it needs formatting, which I have previously done. Is this a bad disc, as 4 out of 5 have worked OK or is it something to do with the recording? Thanks