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Thread: v6.2.1 CD boot error: Input/output error

  1. #1

    v6.2.1 CD boot error: Input/output error

    Verified CD with boot option 'knoppix testcd'
    Past mounting /mnt-system
    Past mounting /KNOPPIX
    Past mounting /UNIONFS
    Past symlinks to /UNIONFS

    Following error found:
    /init: exec: line 742: /sbin/init: input/output error

    The following cheat codes were used with no success.
    knoppix vga=0
    knoppix (1-5)
    knoppix acpi=off noapic nolapic pci=bios hpet=off nodma
    knoppix acpi=off pnpbios=off noapic noapm

    knoppix vga=0 debug -b 3

    Using 'debug' boot option and typing 'exit' at each prompt, the system stalls at the following prompt:
    BusyBox v1.14.2 (Debian 1:1.14.2-2) built-in shell (ash)
    Enter 'help' for a list of built-in commands.
    sh: can't access tty; job control turned off
    / #

    At this point, I typed 'exit' and then 'init 5' but still have a blank screen.

  2. #2
    Senior Member registered user
    Join Date
    Dec 2009
    The input/output error thingie with /sbin/init, seems to be a fairly common problem, not limited to knoppix only. The errors seem to be due to /sbin/init failed to open /dev/console for input/output, but nobody seems to have found out why it happens only to certain systems :-

    Perhaps you can try to debug it by checking the permission of /dev/console and also do some chmod, when you run it under debug mode.


  3. #3

    Solution found

    Thanks 'kl522' for your suggestion, however, it seems that 'input/output' error could be due to many possible causes. To change the permissions on a clean downloaded distribution doesn't make sense.

    In my case the problem was with my CD which explains why a file could not be read i.e. input error.

    My solution was simple:

    - used a new, clean, high-quality 700MB CDR
    - burned at slowest speed 4x
    - OPTIONAL: increased the cache and RAM buffer size

    As per the forums, most errors are due to:
    1. Incomplete/bad download
    2. Bad burn

  4. #4
    Administrator Site Admin-
    Join Date
    Apr 2003
    Quote Originally Posted by peter.hentrich View Post
    As per the forums, most errors are due to:
    1. Incomplete/bad download
    2. Bad burn
    yup, and both easily preventable:
    1) Use the torrents rather than the mirrors, and do the simple md5 test. If you don't want to learn how to do either because you have never done them before, then it is very likely that Knoppix and Linux are not for you and you should stay with Windows.
    2) Burning at slow speed, as an ISO, with burning software that supports both ISO burning and verification after burning (such as Nero) with verification enabled should give a good burn.
    Verifying of md5 checksum and burning a CD at slow speed are important.

  5. #5

    Smile Downloads and burning

    Harry, thanks for your experienced advice and patience with first-timers like me.

    These are simple measures to ensure successful CD/DVDs:

    1a) Use the torrents rather than the mirrors
    Yes, this is the best option. Using a torrent does not eliminate errors though, as I discovered. Whether by user error or otherwise, my 'uTorrent' download was incomplete even when it said "finished". I had to re-check/re-start my download.

    1b) Do the simple md5 test
    Yes, this step should be mandatory after a finished download. Foolishly, I ignored this hash key verification and trusted my torrent application to verify the complete download.

    For an explanation of the procedure, go to: s_that_accompany_the_ISO_CD_images.3F

    It's a single command:
    md5sum -c KNOPPIX_xxxxxxxx.iso.md5
    Here is the erraneous output after my first attempt of the uTorrent download:
    md5sum -c KNOPPIX_V6.2.1CD-2010-01-31-EN.iso
    md5sum:   @@@@@@@@@@@@@@@@@@@@@@@@@@ : No such file or directory
      @@@@@@@@@@@@@@@@@@@@@@@@@@ : FAILED open or read
    md5sum: int1e = %08x: No such file or directory
    int1e = %08x: FAILED open or read
    md5sum: WARNING: 2 of 2 listed files could not be read
    Here is the successful output after I 're-checked' and 're-started' my uTorrent download:
    md5sum -c KNOPPIX_V6.2.1CD-2010-01-31-EN.iso.md5
    KNOPPIX_V6.2.1CD-2010-01-31-EN.iso: OK
    Knoppix is working and an important lesson learned.

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