Andy Polyakov wrote: >>>>Please, check the version explicitly with 'growisofs -version'. I [for >>>>one] don't keep track on which version is shipped with any particular >>>>distro or when updated. If it's less than 5.19 (as mentioned at >>>>http://fy.chalmers.se/~appro/linux/DVD+RW/hcn.hml), then update. If not, >>>>submit the actual dvd+rw-mediainfo output for the media in question. >> >> ok, the problem got worse when i upgraded to 5.21. now growisofs changes >> the write speed to 8x, but the actual writing of the disk tops out at >> 2.5x. > > Is it possible that DMA was on by then, but not now anymore? Then keep > in mind that if you set recording velocity to value higher than your > system can sustain, then resulting *actual* or *effective* speed doesn't > flat out at the latter value, but on some value *lower* than that. And > depending on firmware implementation it can apparently drop down > *dramatically*. In other words if your system for example can manage > only 6x [for whatever reason, which most likely will end up beyond the > scope of this discussion] and you make unit record at 8x velocity, the > resulting *effective* speed might as well be 2.5x. That's because unit > will have to take idle revolutions... For optimal performance [and > recording results] you should choose recording speed just a bit lower > than your system can deliver. A.
Thanks for the reply, that was very helpful. Unfortunately, I haven't had time recently to play around with it to try to fix the problem. I'll post when (if) I figure it out. Thanks.
