[TriLUG] more DVD-burning questions

[Brian Henning]

Okay, I think I've created my first DVD+R DL coaster.  Unfortunately I 
wisely didn't check its integrity before I deleted my source 
files...fortunately it was a non-critical disk image, so the loss is 
only a minor setback.

But here's the thing.  I never got ANY error messages during the 
creation phase, with the single exception of the DVD+RW drive's LED 
blinked red when I hit the eject button.  I have no idea what that 
means, and I can't find any documentation on it.

The original file was a .gz disk image, about 3.8GB in size.  mkisofs 
did not complain about building an ISO from it.  cdrecord burned it in 
1111.301 seconds, and fixated in 0.406s (which does seem odd, being used 
to much longer fixating times for CD-R/RWs), and exited normally.

But I can't mount it.  mount gives the usual "bad superblock [etc. etc. 
etc.]" error.  I can visually look at the disc and see the tell-tale 
moire texture, the data's definitely on there, but I can't get to it at 
all.

I tried to simply grab whatever was on the disc with "dd if=/dev/cdrom1 
of=afile bs=1024 count=4096M", but apparently that depends on the 
filesystem properly existing in some form or other because dd exited 
immediately with 2+0 records in and out.

Here's a summary of what I did:

media: 8.5GB Double-Layer DVD+R

% mkisofs -o image.iso -V VolumeName -R -J image.gz
... several minutes later, mkisofs spits out a 3,991 MB .iso
% cdrecord -dev=/dev/cdrom1 -verbose -dao -driveropts=burnfree image.iso
... 1123.707 seconds later, cdrecord exits with no errors.
Hit the eject button, drive blinks red and ejects the disc.

Sorry for being an idiot but I could really use some help here..  I'm 
clearly missing something but I don't know what..

Thanks a lot!
~Brian

-- 
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Brian A. Henning
strutmasters.com
336.597.2397x238
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