To write it as a stream I used growisofs -Z /dev/scd0=/image/file This is on a DVD +R medium, in Linux. I don't know whether Nero under Windows will do that. It seems to me that it's almost like using dd to copy the data. 2048 was the block size I used too. You're right, I am using loop-aes, pseed and itercount are just to make the thing less vulnerable to a precomputed pasword guess attack, I think. They're not needed to make it work. Good Luck, Paul Hilton On Thu, 2005-01-27 at 16:09, info@xxxxxxxxxxxx wrote: > >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/
