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 -
>>>>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?
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