Checking burned image is ok
in [Debian]
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From: Mathieu Malaterre on 27 Jul 2010 05:00 Hi there, I am looking for a way to check I did burn my debian installer iso properly. I am trying: $ cmp /dev/cdrom debian-505-powerpc-netinst.iso This works on CD-RW, but it fails on CD-R with the following: cmp: /dev/cdrom: Input/output error Has anyone seen this before ? How else could I check the CD-R is actually properly burned ? Thanks ! -- Mathieu -- To UNSUBSCRIBE, email to debian-user-REQUEST(a)lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmaster(a)lists.debian.org Archive: http://lists.debian.org/AANLkTimCVAUW2AcDqojKACEGnc+m1_RfMr1ZW1RppHs7(a)mail.gmail.com
From: Cesar Garcia on 27 Jul 2010 06:30 Hi! try it with md5sum: $ md5sum debian-505-powerpc-netinst.iso $ dd /dev/cdrom bs=$blocksize count=$blockcount conv=notrunc,noerror | md5sum The variable, $blocksize, $bolkcount, depend of the CD or DVD, to get this info: $ isoinfo -d -i /dev/cdrom the result must be the same. El 27/07/10 10:50, Mathieu Malaterre escribi�: > Hi there, > > I am looking for a way to check I did burn my debian installer iso > properly. I am trying: > > $ cmp /dev/cdrom debian-505-powerpc-netinst.iso > > This works on CD-RW, but it fails on CD-R with the following: > > cmp: /dev/cdrom: Input/output error > > Has anyone seen this before ? How else could I check the CD-R is > actually properly burned ? > > Thanks ! > -- To UNSUBSCRIBE, email to debian-user-REQUEST(a)lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmaster(a)lists.debian.org Archive: http://lists.debian.org/4C4EB40E.3090006(a)gmail.com
From: Camaleón on 27 Jul 2010 06:30 On Tue, 27 Jul 2010 10:50:09 +0200, Mathieu Malaterre wrote: > I am looking for a way to check I did burn my debian installer iso > properly. IIRC, Debian installer provides a "check media CD" option, so you can use that. > I am trying: > > $ cmp /dev/cdrom debian-505-powerpc-netinst.iso > > This works on CD-RW, but it fails on CD-R with the following: > > cmp: /dev/cdrom: Input/output error > > Has anyone seen this before ? How else could I check the CD-R is > actually properly burned ? I think you could just: cd /media/cdrom md5sum -c md5sum.txt Also, it seems to be a "checkiso" script that can be useful for this task. http://www.debian.org/CD/faq/index.en.html#verify Greetings, -- Camaleón -- To UNSUBSCRIBE, email to debian-user-REQUEST(a)lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmaster(a)lists.debian.org Archive: http://lists.debian.org/pan.2010.07.27.10.23.02(a)gmail.com
From: Mathieu Malaterre on 27 Jul 2010 06:40 On Tue, Jul 27, 2010 at 12:25 PM, Cesar Garcia <cesar.garcia.beneyto(a)gmail.com> wrote: > Hi! > > try it with md5sum: > > $ md5sum debian-505-powerpc-netinst.iso > > $ dd /dev/cdrom bs=$blocksize count=$blockcount conv=notrunc,noerror | > md5sum > > The variable, $blocksize, $bolkcount, depend of the CD or DVD, to > get this info: > > $ isoinfo -d -i /dev/cdrom > > the result must be the same. That seems to have worked ok: $ md5sum debian-505-powerpc-netinst.iso 86268f3a463460828ec12831d6520df7 debian-505-powerpc-netinst.iso $ isoinfo -d -i /dev/cdrom CD-ROM is in ISO 9660 format System id: LINUX Volume id: Debian 5.0.5 ppc Bin-1 Volume set id: Publisher id: Data preparer id: Application id: GENISOIMAGE ISO 9660/HFS FILESYSTEM CREATOR (C) 1993 E.YOUNGDALE (C) 1997-2006 J.PEARSON/J.SCHILLING (C) 2006-2007 CDRKIT TEAM Copyright File id: Abstract File id: Bibliographic File id: Volume set size is: 1 Volume set sequence number is: 1 Logical block size is: 2048 Volume size is: 102188 NO Joliet present Rock Ridge signatures version 1 found $ dd if=/dev/cdrom bs=2048 count=102188 conv=notrunc,noerror | md5sum 102188+0 records in 102188+0 records out 209281024 bytes (209 MB) copied, 56.3156 s, 3.7 MB/s 86268f3a463460828ec12831d6520df7 - Thanks ! -- Mathieu -- To UNSUBSCRIBE, email to debian-user-REQUEST(a)lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmaster(a)lists.debian.org Archive: http://lists.debian.org/AANLkTinyDM5_XGTg4bhzuCqhkMTf2TzgjoGANaPTD3gr(a)mail.gmail.com
From: Bob McGowan on 27 Jul 2010 12:10 On 07/27/2010 01:50 AM, Mathieu Malaterre wrote: > Hi there, > > I am looking for a way to check I did burn my debian installer iso > properly. I am trying: > > $ cmp /dev/cdrom debian-505-powerpc-netinst.iso > > This works on CD-RW, but it fails on CD-R with the following: > > cmp: /dev/cdrom: Input/output error > > Has anyone seen this before ? How else could I check the CD-R is > actually properly burned ? > > Thanks ! Others have posted regarding using check sums. The "advantage" to using 'cmp' is you get a byte by byte, exact match check. If that's what you want or need, use Cesar Garcia's suggestion to get the parameters of your CD image and use dd to read the disk, only instead of piping the output to md5sum, do this: dd .... | cmp - debian.iso which compares the stdin from dd with the file. This will avoid the error you noted above. The "problem" with using cmp directly on the device has to do with how the device driver handles what would be considered EOF. All that happened in your cmp run was an attempt to read beyond the end of the device. Unless 'cmp' produced a "files differ: byte xxxx, line yyy" type of message, the 'cmp' actually succeeded in properly comparing the two images. -- Bob McGowan -- To UNSUBSCRIBE, email to debian-user-REQUEST(a)lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmaster(a)lists.debian.org Archive: http://lists.debian.org/4C4F00A3.6080404(a)symantec.com
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