El dom, 21-12-2008 a las 15:52 +0000, steef escribió: > > El sáb, 20-12-2008 a las 09:45 +0000, steef escribió: > >> Eduard Bloch wrote: [...] > >>> Try this: > >>> > >>> mount foo.nrg /bla -oloop,offset=307200 [...] > hi eduardo, > > i did: > > steef@etchschijf:~$ sudo mount /home/steef/Desktop/pf2.iso > /home/steef/Desktop/ISO -t iso9660 -o loop > mount: wrong fs type, bad option, bad superblock on /dev/loop0, > missing codepage or other error > In some cases useful info is found in syslog - try > dmesg | tail or so > the same thing happened with the original nrg_file out of which pdf2.iso > was derived. > > i'll look into the logs, allthough i know for sure the pdf2.iso file is > corrupt. > the command mounted another non-corrupt iso.file without a problem in > the ISO directory. > I just found this: > I have successfully mounted several .NRG files under Linux. The key: > it appears that an .NRG file has 300KB (75x4096) = 307200 bytes > pre-pended to the ISO image. > > So I was able to do this as root: > > mkdir /media/loop_cd > mount -o norock,map=off,loop,offset=307200 > imagefile.nrg /media/loop_cd > > and it worked. (the norock,map-off options are optional) > > One could then easily convert NRG to ISO by using dd like this: > > dd if=imagefile.nrg of=isofile.iso bs=4096 skip=75 > > I'm not sure if the offset is always 4096x75 bytes, but it has been in > all the .NRG files that I've tried. > > TECHNICAL DETAILS: > > If you do this on an .NRG file: > > linuxprompt$ od -Ad -c file.nrg | more > > you see output like this: > > 0000000 \0 \0 \0 \0 \0 \0 \0 \0 \0 \0 \0 \0 \0 \0 \0 \0 > * > 0339968 001 C D 0 0 1 001 \0 > 0339984 > > while on an ISO you see this: > > 0000000 \0 \0 \0 \0 \0 \0 \0 \0 \0 \0 \0 \0 \0 \0 \0 \0 > * > 0032768 001 C D 0 0 1 001 \0 W i n 3 2 > 0032784 > > Note that the line with the CD001 signature is at address 32768 on the > real .ISO file, while it is at address 339968 in the .NRG file. A > simple calculation then reveals the offset: > > 339968 - 32768 = 307200. > > So, if the offset of 307200 doesn't work for you on an .NRG file, just > try the "od" command above on the file to see the offset is the same. > It might be that on multisession images, or on other types of source > discs (DVD, etc), or maybe even different versions of Nero, that the > offset changes. > Taken from: https://answers.launchpad.net/ubuntu/+question/5979 I don't have any nrg image here to try it...
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