Re: FC3 mediacheck

From: Reshat Sabiq (sabiq_at_csociety.org)
Date: 07/11/05

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    Date: Sun, 10 Jul 2005 23:05:55 -0500
To: akonstam@trinity.edu, For users of Fedora Core releases <fedora-list@redhat.com>

    akonstam@trinity.edu wrote:

    >On Fri, Nov 12, 2004 at 10:12:17PM -0500, Erik Hemdal wrote:
    >
    >
    >>>>>md5sum -c MD5SUM
    >>>>>
    >>>>>I've already indicated this once. After successful MD5SUM check - boot
    >>>>>with 'linux ide=nodma' and then do the MediaCheck.)
    >>>>>
    >>>>>
    >>I think this comment was from Satish about ide=nodma. Why is that
    >>necessary? I've encountered the mediacheck failures similarly for the
    >>first time ever. If the drive operates normally, why do we need nodma
    >>in order to check only disk2 and disk3 of the CD set?
    >>
    >>I'm not intending this as disrespectful to anyone; I'm truly curious
    >>about it. Out of the four install images, all four pass the MD5
    >>checksum test, and two out of four pass the mediacheck. On my CD
    >>writer, cdrecord reports that the buffer was always adequately filled
    >>and burnfree protection was never needed. So assuming the integrity of
    >>the media is OK (seems to be, since cdrecord reports no errors and the
    >>CD is readable), I'd suspect a problem with the original ISO image.
    >>Whether you use DMA or not on your drive doesn't seem to have any
    >>bearing on things....else other I/O would have trouble too.
    >>
    >>Am I missing something?
    >>
    >>Erik
    >>
    >>
    >>
    >I don't know what you are missing but with some hardware the ide=nodma
    >is necessary for to mediacheck to work and the installation from CD's
    >to work without getting read errors.
    >
    >
    I encountered the nodma issue when i was upgrading to FC3 last year as
    well. For some time i thought that nodma might be needed on all read
    operations on such hardware, but i'm no longer sure that's the case.
    There might be a corrrelation though between this issue and the fact
    that Linux media players crash on me on one out of about 8 or 10 DVDs.
    Might suggest that there's something wrong with the driver causing both
    issues. 

    


    


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