>I have been quite successful at doing this, I make a file backed up >image of an ext2 filesystem, which I can mount, fill with files, close >and then write directly to the DVD (as a stream, not as an iso image). >Then I can mount the DVD the same way, and read the individual files >from it. What is the difference of writing it "as a stream" or as an ISO? I do not know how to write a DVD as a stream. I have only one DVD-Writer and it is in a Windows-PC, so I use Nero to burn the image file... I can use either ISO or Data Mode 1 with 2048 Blocksize. Both will work, but both have those errors I mentioned in some files. How do I write a stream? What parameters do I have to choose when doing that? >The relevant bits in fstab are: > >/somewhere/cdvdimage /someplace/CDVDimage ext2\ > defaults,noauto,user,loop=/dev/loop3,encryption=AES128,\ > itercountk=100,pseed=SomeJunk 0 0 Ok, mine is similar. I use twofish-256 though and I do not know what itercountk and pseed means. Maybe it is something that is needed by AES? You use AES-loop and not cryptoloop? >I made sure to format the image file with a suitably large blocksize. What block size do I need? Can you give me the command line how to make a good image file? I used "dd /dev/zero FILE bs=2048 count=<something to make it 4 GB>" and then "losetup -e twofish-256 /dev/loop7 FILE" and then "mke2fs -j /dev/loop7", although I guess the -j is useless for a ro-device? >I am very skeptical about how readable my DVDs will be after some years, >but I haven't had one fail yet. I certainly don't get many errors. Hmmm - Maybe it is a hardware error that makes those errors. I will try a different DVD-ROM. I need to make a backup of my root-system without /home so I can open these DVDs later even if I need to use a Virtual Machine and put the backup into is... >Hope that's helpful,<< Thanks a lot, but so far, you seem to be doing almost the same as I did. Except for the things I mentioned above. MAybe if you could tell me more about these, I can sort out the problem. But then - maybe it really is a hardware problem. Ciao - Linux-crypto: cryptography in and on the Linux system Archive: http://mail.nl.linux.org/linux-crypto/
