[TriLUG] more DVD-burning questions

[Pat Regan]

Brian Henning wrote:
> 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.
> 

I would advise against trying to burn any files over 2 GB.  I am pretty
sure mkisofs doesn't actually complain, for some strange reason...  When
I first started burning DVDs, I tried burning a file a bit over 2 GB.
The disc burned, and could be mounted.  The filesizes were reported very
incorrectly, and the files weren't readable.

> 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.
> 

This makes it sound like there is absolutely no data on the disc, or the
drive can't read the disc.  Have you tried the disc in another machine?
 I have a burner here that sometimes can't read discs that it burned
(but every machine I put them in can read them just fine).

> 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.
> 

I would assume that the activity of the LED would be manufacturer, and
perhaps device, specific.

Pat
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