On Monday 05 Dec 2016 20:09:58 Michael Schwendt wrote:
On Sun, 4 Dec 2016 19:20:28 -0700, jd1008 wrote:
> > Same thoughts here. One could use /dev/cdrom, which should be a link to
> > /dev/sr0, for reading and creating an ISO image, but not for setting up
> > the device to burn discs "magically".
>
> Michael, Michael...
> I have no idea what you mean by ' burn discs "magically" '
> Who said anything about magically.
*I* did, because since "dd" doesn't know anything about the underlying
hardware it talks to, it would need to be the device driver to configure
the hardware for writing, setting writing speed, buffering options,
detecting media and its writing speed range and not finalising the write
on end.
The safe cmdline way for burning discs has been "cdrecord" for many
years.
It may be that "dd" could write to special preformatted discs and possibly
with hardware and media that would work together by default. I don't think
it has ever been a fully supported method.
Look what this guy found out in Nov 2015.
http://www.stevepedwards.com/DebianAdmin/2555-2/
Somewhere at the bottom find an example of writing to /dev/sr0 with "dd"
after taking several hurdles.
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Its tiresome
reading this kind of "gui mindness"
Device drivers have a limited number of entry points open, close, read, write
& ioctl.
Without knowing anything about the internals of the cd drivers I can
confidentally assume that all cdrecord does is use a few driver specific
ioctls to put the driver (& device) into an appropriate mode then issues
write(2) system calls - which is pretty much all dd will do.
So if the device is in the correct mode dd will do fine.