If you are using somekind of buffer underrun protection or similar, it will lower your burn speed if the higher speed would do bad job. You can take this off, but it might cause defective discs. You should also check out K3b's write speed setting -- is it "automatic"? In this case K3b uses the speed it thinks is best for the result; it might vary. You can set this too to be something specific, but again, it might affect the result.
It's not a problem with Linux I think, you should check the other reasons first. That's because I know people who have burned DVDs on higher speeds than 6x.
EDIT: I've experienced with regular writable cds that if one uses very high burn speed, the disc doesn't last as long as a similar disc burned with a lower speed; by this I mean that the high-speed written discs become unreadable (by the same drive I've tried these on) quicker than the low-speed written discs. The result isn't visible right away, but if you store the discs for a long time you should see it. I could think it's exactly the same thing with DVDs, so if you aren't in a hurry and plan to use the disc for a long time, consider using non-maximum speeds. Though if you just use the disc once or twice or overwrite the rw disc soon, it's not that big a matter.
Last edited by b0uncer; 11-24-2006 at 03:06 PM.
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