Seeker Jan 11, 2010 #1 I've burned .iso image to CD-RW with burncd Now I wana compare optical media, to that file.iso :stud So I can ensure that, there are no data read errors, on optical media. How do I do that? :stud
I've burned .iso image to CD-RW with burncd Now I wana compare optical media, to that file.iso :stud So I can ensure that, there are no data read errors, on optical media. How do I do that? :stud
DutchDaemon Administrator Staff member Administrator Moderator Developer Jan 11, 2010 #2 Use md5(1) and/or sha256(1) to get hashes of the original and the copy? Something like: Code: md5 file.iso /mnt/cdrw/file.iso sha256 file.iso /mnt/cdrw/file.iso This should produce two sets of identical hashes.
Use md5(1) and/or sha256(1) to get hashes of the original and the copy? Something like: Code: md5 file.iso /mnt/cdrw/file.iso sha256 file.iso /mnt/cdrw/file.iso This should produce two sets of identical hashes.
OP Seeker Jan 11, 2010 Thread Starter #3 I can't use yours method, as once burned file.iso to optical media, does not contain file.iso, as it is image. So newly burned and mounted optical media contains list of files and not file.iso on which I could use md5 or sha256 So, yours method is applicable only after this: Code: # dd if=/dev/acd0 of=filename.iso bs=2048 Now I can use: Code: # md5 filename.iso already_burned.iso # sha256 filename.iso already_burned.iso
I can't use yours method, as once burned file.iso to optical media, does not contain file.iso, as it is image. So newly burned and mounted optical media contains list of files and not file.iso on which I could use md5 or sha256 So, yours method is applicable only after this: Code: # dd if=/dev/acd0 of=filename.iso bs=2048 Now I can use: Code: # md5 filename.iso already_burned.iso # sha256 filename.iso already_burned.iso
Ruler2112 Jan 11, 2010 #4 In Linux (and probably BSD as well) you can md5sum an unmounted device and it'll do exactly what you want. Code: md5sum /dev/scd0 file.iso I haven't tried it, but you could probably pipe the output of a dd command into md5sum to bypass writing to disk. Something like: Code: dd if=/dev/acd0 bs=2048 |md5;md5 file.iso Again, I have not tested this, so I don't know if it would work or not. Don't see why not though.
In Linux (and probably BSD as well) you can md5sum an unmounted device and it'll do exactly what you want. Code: md5sum /dev/scd0 file.iso I haven't tried it, but you could probably pipe the output of a dd command into md5sum to bypass writing to disk. Something like: Code: dd if=/dev/acd0 bs=2048 |md5;md5 file.iso Again, I have not tested this, so I don't know if it would work or not. Don't see why not though.
