Andre Robatino wrote:
If anyone out there has experienced mediacheck failures with Red Hat or Fedora discs in the past, and still has both the discs in question and a F8 or rawhide box using the same CD or DVD drive that was being used when doing the mediacheck, could you run the following test? Use the rawread script fromhttp://www.troubleshooters.com/linux/coasterless.htm to read off the contents of the disc ISO as follows: ./rawread /dev/cdrom > disc.isoIf repeated read errors are experienced, stop it with Ctrl-C and check the size of disc.iso. If the file is short of the expected size by less than about 150 KB, this indicates that the read error is probably caused by the readahead bug (wget -c can be used to download the remaining part of the file from download.fedora.redhat.com, and sha1sum can be used to verify that the resulting file is correct). Any reports, either positive or negative, would be appreciated. Both I and my father are using identical DVD drives (Sony DRU-120C) in different machines, and experience the readahead bug in F8. Whether the bug manifests depends both on which kernel is being run, and on which CD/DVD drive is being used. Zero-padding the disc while burning prevents the bug from manifesting. I've reported the problem athttps://bugzilla.redhat.com/show_bug.cgi?id=397141 but so far there have been no corroborating reports.
After doing some further tests, I find that I can only reproduce the problem with CDs, not with DVDs. So if anyone has unpadded CDs, such as rescue CDs, and a Fedora box with a >= 2.6.23 kernel and a CD/DVD drive that has ever had mediacheck problems in the past, could you attempt reading them with the rawread script to see if the read fails near the end? Thanks.
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