[mythtv-users] cdrecord-ProDVD vs. growisofs readcd bad md5sum?
Slightly OT
Cory Papenfuss
papenfuss at juneau.me.vt.edu
Thu Sep 9 11:35:40 EDT 2004
I know this might be a bit off-topic, but I ran into it while burning
mythtv-related discs... does that make it count? :)
A bit of history. Awhile back, I'd bothered to install the binary-only
cdrecord-ProDVD, but after it expired a few weeks ago I decided it was time to
use a different tool. I used to use 'dd if=/dev/cdrom of=test.iso ; md5sum
test.iso' to verify a CD/DVD image burned had a good checksum. Discovering
some padding vs. non-padding vs. block boundaries, I found 'readcd' to be a
better CD imaging tool.
Now that I'm using 'growisofs -dvd-compat -Z /dev/dvd=someimage.img' to
record dvd's, it doesn't appear to be closing them properly. At least with
readcd, the image comes back a different size than the original image (so of
course fails to checksum). I think that manually reading the data back with
'dd if=/dev/cdrom bs=2048 count=(volume size from isoinfo)' results in the
correct image/checksum.
Any thoughts on this? With the archival prospects of nuvexport and DVD
writing imminent, this might be a good problem to work out. I thought I'd
figured out reading block-copy CD images once I found readcd... perhaps not.
-Cory
*************************************************************************
* Cory Papenfuss *
* Electrical Engineering candidate Ph.D. graduate student *
* Virginia Polytechnic Institute and State University *
*************************************************************************
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