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  • works Problems reading burnt ext2 DVDs [2003.12.10]

    Eric Waters suggests it might be a block size issue

    I've not had anyproblems with a block size of 1024, but Eric said he checked it out and 2048 was the appropriate blocksize for DVDs, so that might be it

    I found your website in a google search for info on burning DVD's in
    Linux. After following your instructions, I was able to nicely burn an
    unmountable ext2 DVD. The problem, I discovered (through the help of
    http://www.linux.net.nz/lists/NZLUG/2003/07/1243.html), is that the DVD
    is burned with a sector size of 2048k, so therefore the blocksize of the
    ext2 image (created with dd and mke2fs) must be 2048, *not 1024*.

    So, instead of:

    dd \
    if=/dev/zero \ # read input for file from /dev/zero
    of="ext2_file" \ # output file
    bs=1024k \ # file has block size of 1024k [1 Megabyte]
    count=4096 # file has 4096 blocks [4 Gigabytes]

    mke2fs \
    -b 1024 \ # block size
    -F \ # Force [I shouldn't have to use this, but I do]
    ext2_file # input file

    ... it should be this:

    dd \
    if=/dev/zero \ # read input for file from /dev/zero
    of="ext2_file" \ # output file
    bs=2048k \ # file has block size of 2048k [2 Megabytes]
    count=2048 # file has 2048 blocks [4 Gigabytes]

    mke2fs \
    -b 2048 \ # block size
    -F \ # Force [I shouldn't have to use this, but I do]
    ext2_file # input file?

    You might want to add this to the webpage so others don't burn a coaster
    like myself.

    Eric Waters

    Posted by Dorian Moore on Wednesday, December 10, 2003 at 13:43 GMT
    Last modified Thursday, October 20, 2005 at 20:22 GMT

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