Paul E Condon wrote : > On 2009-03-19_05:29:17, M. Lewis wrote: >> thveillon.debian wrote: >>> M. Lewis a ??crit : >>>> I've burned a CD from a .iso image. Now I want to verify the burning >>>> process worked correctly (there were no errors reported). Note, I >>>> verified the md5sums of the .iso's before I burned them. So now I'd like >>>> to check the burned CD against that md5sum. >>>> >>>> Thanks, >>>> Mike >>> Hi, >>> >>> "md5sum /dev/cdrom" or "md5sum /dev/scd0" works here (Squeeze and >>> Lenny), whatever applies to your system. >>> If you have I/O error check that it's not mounted, and not accessed by >>> some other process (like "kio*" in KDE). >>> >>> Tom >> Great. Thanks Tom. I was totally unaware it could be done as simply as that. >> > > Several months ago, when Lenny was still 'testing', I had difficulty > with this: On my hardware, the read from /dev/cdrom had extra bytes at > the end and was a longer byte stream than the .iso image from which > the CD was burned. So, of course, compare of md5 sums between CD and > .iso failed. There is a work-around in that one can use dd to copy > from /dev/cdrom just enough blocks to match the length of the .iso > file, and then compute the md5sum of that (truncated) length matching > file. OTOH the problem may not have been hardware, and it may have > been fixed. So if at first you get results that indicate that you have > a badly burned CD, it may be the test that is bad, not the burn. > > I have not verified this situation recently, so this is just a warning. > I think there are many people like me who know about this old problem, > so it would be nice for you to report back to the list as to whether or > not it is still there. >
Following a similar thread on the French list where this problem was also related, I did some testing with dvd's and cd's, GNU-Linux distros and movies burnt with K3B, on Lenny "almost" stable and lately on Squeeze. I didn't come across any issue, so at least here it works fine. Tom -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org