I recently ordered a quantity of 2x DVD-RW and the supplier was out of stock and kindly sent me 4x at no extra charge. These discs do not work in either the Toshiba RDXS32 or the Pioneer 5100. Whilst the manuals state that they work with 2 x DVD-RW I was surprised that they didn't use the 4x discs albeit at 2x speed. Has anyone seen or heard of firmware upgrades for the DVD drives in HD combo recorders in the same way that PC DVD drives get firmware upgrades? It would appear that we might find it increasingly difficult to get discs that work with these machines. I was particularly suprised at the Toshiba chucking the 4x discs as it is such a new machine.