Re: growisofs failed to change write speed
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.