Burnt a couple of DVD-R's last night, the machine accepted them fine, Ritek G04 and Fuji's. All ok in the Tosh. However, they do not play in Sony players From my experience anything that plays in a Sony will be be very universally compatible. Although, the discs did play fine in Samsung & Panasonic players. The Panasonic recorders do produce fully Sony compatible finalised discs, which is a big plus for them. I will try tonight without authoring Toshiba menu's on the DVD-R's as they may be the root cause of the problem. Otherwise it is simply the writing strategy Toshiba has employed in it's software.