They are quite bad results! Burning at the slower speed really should be producing a better quality burn. I'd have to guess that your burner is having issues. Also when performing tests, I personally always try to produce consistent results at least twice - to confirm the end results. In your case, I would have burned 2 discs (of the same brand) and tried them both in each machine. That way, if you did have a bad burn (when testing just one disc) you would be able to clearly recognise it and wouldn't write off the branded disc as being bad quality. Of course if the burner is playing up and both discs were shot then that would probably skew your thinking if you didn't take your testing any further - i.e. try same brand discs in a different burner, to be sure. I use TDK discs and haven't made a single coaster yet. But I'm burning with my AlBook Superdrive at 1X. My 16X LaCie DL burner is hopefully arriving tonight. In the coming days I may be changing my tune! ;-D Cheers, Coj Nick Scalise <nickscalise at mac.com> So I burn a different, new image at 4x on the TDK's 8X DVD-R and I get even worse results at the Mart: Portables: Polaroid No Toshiba OK Sony No Panasonic No Toshiba II No Apex No Coby No SetTops: Coby No Coby II No Pioneer OK JVC No Panasonic No Sony OK JVC II NO Toshiba No Norcent No Samsung No Anybody have any clue as to why these dvd's are failing when burned at half speed? Could it be my burner? -- Nick Scalise nickscalise at mac.com