Hi, Report back on this thread and copy cd.. It seems the question of a cd will md5sum pass boils down how it was recorded....if it does not pass md5sum does not mean there is technically something wrong with such cd. ******** If it was recorded in Track At Once .. TAO then it will not md5sum and unable to use dd to copy....use readcd. NOTE: All CD-R's written in Track At Once mode end in two unreadable run-out sectors. To prevent readcd from reading the run-out sectors, reduce the number of sectors to copy by 2. This iso and the resulting burned cd will md5sum if written in DAO..Disk At Once. *************** If it was recorded in Disk At Once...DAO...mode it will md5sum and be able to use dd to copy such cd. *** There is also cdrdao to copy & burn cd's..it needs some study. All of them actually needs some study. *** Please note...all the above is taken to be *linux data* cd's and that the media is not defective. *** For those interested to copy and write cd's in DAO.....some commands...that works for me on mdk9.2...since the study.. * cdrdao blank --eject --device 0,0,0 ... this is a short blank. cdrdao read-cd --device 0,0,0 cd1 cdrdao read-cd --read-raw --datafile cd2.iso --device 0,0,0 cd2 cdrdao write --device 0,0,0 --speed 8 --eject cd1 * readcd dev=0,0 sectors=0-326656 f=cd1.iso...adjust to sectors reported * cdrecord -v -dao speed=8 dev=0,0 cd1.iso * The last 2 works very nice for me. * Now thankyou very much to those that made input. Special thanks for Izak Burger for detailed and good suggestions..this put me on the right track for finding info and study. All this was meant to understand cd burning/copy more and to make *good* copies for friends and for myself of course. Enjoy -- Johan May this be a good day for learning Registered Linux User #330034 - still learning
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