[KLUG Members] Re: CD Burning, a Question or Two -- don't use standard MO (CD-RW, DVD-RW/+RW)

[Bryan J. Smith]

Quoting Bruce Smith <bruce@armintl.com>:
> find /mnt/cdrom -type f -exec dd if={} of=/dev/null \;

Not always.  That will only tell you if a CRC error occurred.  Sometimes
incorrect data is written.

> I've heard of people runing md5sum's on /dev/cdrom, but I've never got
> it to work since the md5sum seems to change from the disk image to the
> device file after it's burned.  (the once or twice I tried it)

That's because "raw CD" format != ISO9660 Yellow Book (aka .iso images). 
Fortunately, Linux _does_ automatically converts from raw CD to ISO format when
you dd.  So the correct way to get an MD5 to compare to an ISO image is then:
   dd if=/dev/cdrom | md5sum -

Of course, that's only good for comparing to CD images.

If I'm using a CD-RW, DVD-RW or DVD+RW in "packet write" mode, I'm merely using
it like another disk, and randomly writing to it.  So I don't have an image file
to compare it too.

> Yup.  On the mount command (with no fstab entry), you don't even 
> need to specify the filesystem type of "auto".

Auto is assumed on the command-line.

-- 
Bryan J. Smith, E.I. (BSECE)       Contact Info:  http://thebs.org
[ http://thebs.org/files/resume/BryanJonSmith_certifications.pdf ]
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