Joerg Schilling wrote:
If the DVD unit were set to 4x, but data underrun were reducing the effective transfer speed to 2x, would cdrecord report the speed set or the speed achieved? I think the latter, since when burning CDs I see the reported speed change several time over the duration of the burn.The cdrecord README clearly states that you _need_ working DMA in order to write DVDs. If you have burnfree ON the drive just dramatically slows down.
Joerg is very likely to be correct on this, although it would be useful to have an indication of burnfree being in use. I would expect the "min full" report at the end of burn to show the lack of data during the burn.
Joerg, can you give us any reliable way to determine if burnfree was used, and quantify it? Once or twice on a data recording probably doesn't matter much, but frequent use shows problems.
-- E. Robert Bogusta It seemed like a good idea at the time