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Hi, I downloaded a Debian (Wheezy) installer iso image and burned it to a CD. After burning the CD I mounted it and ran the md5sum utility to verify the ...
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  1. #1
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    md5 checksum validation inconsistent


    Hi, I downloaded a Debian (Wheezy) installer iso image and burned it to a CD. After burning the CD I mounted it and ran the md5sum utility to verify the files were good. I got a warning that the checksum was not good for one of the files. I tried reburning the CD, first on the same disk then on another CD-RW. Then I tried burning from a different computer. Each time I ran md5sum it reported that the checksum was not good for one of the files but the particulator file reported as having the invalid checksum was different each time I mounted the CD.
    Code:
    prompt$ md5sum -c md5sum.txt --quiet
    ./pool/main/g/grub2/grub-common_1.99-23_amd64.deb: FAILED
    md5sum: WARNING: 1 of 801 computed checksums did NOT match
    I tried mounting the downloaded iso image directly using
    Code:
    promt# mount -o loop -t iso9660 debian-wheezy-DI-b4-amd64-netinst.iso /mnt/test/
    Again one of the 801 files was found to have an invalid checksum. In another attempt two files were reported as having an invalid checksum.
    What is causing this problem? Is the problem due to checking the md5sum on a mounted iso filesystem? At first I thought it might be bad CD-RW media or CDwriter problems but since I get the same type of problem when mounting the iso image stored on the hard drive, that does not seem to be the case.

    The computer I am burning the CD from is 32-bit yet the installer is for a 64-bit machine. Would that have something to do with it?


    Thanks

  2. #2
    Linux Guru Rubberman's Avatar
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    It sounds like your system either has a media or disc controller problem. Try it on another system.
    Sometimes, real fast is almost as good as real time.
    Just remember, Semper Gumbi - always be flexible!

  3. #3
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    Quote Originally Posted by OverBoard View Post
    Hi, I downloaded a Debian (Wheezy) installer iso image and burned it to a CD. After burning the CD I mounted it and ran the md5sum utility to verify the files were good. I got a warning that the checksum was not good for one of the files.

    I tried mounting the downloaded iso image directly using
    Code:
    promt# mount -o loop -t iso9660 debian-wheezy-DI-b4-amd64-netinst.iso /mnt/test/
    Again one of the 801 files was found to have an invalid checksum. In another attempt two files were reported as having an invalid checksum.
    What is causing this problem? Is the problem due to checking the md5sum on a mounted iso filesystem? At first I thought it might be bad CD-RW media or CDwriter problems but since I get the same type of problem when mounting the iso image stored on the hard drive, that does not seem to be the case.

    Thanks
    Have you tried to identify which file has the invalid checksum?

    Code:
     md5sum -c md5sum.txt | grep -v OK
    Any md5sum lines that do not say OK will be shown.This should help in isolating the problem.

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