Jonathan Allen wrote:
Paul Howarth wrote:
You could read back the data from the CD device using dd and then
compare what you get back with the original ISO.
Thank you for the suggestion. I just tried:
# dd if=/dev/cdrom of=file
Try:
# dd if=dev/cdrom of=file bs=2048
and got a clutch of errors like:
hdc: command error: status=0x51 { DriveReady SeekComplete Error }
hdc: command error: error=0x50 { LastFailedSense=0x05 }
ide: failed opcode was: unknown
end_request: I/O error, dec hdc, sector 1904, 1912, 1920, etc in turn
What does that mean ? The result produces a file 901120 bytes long, when
the original ISO file is 987136 bytes long, but at least at the front they
look pretty identical to 'od -c'
When the drive is mounted, all the files on the CD seem OK and don't
generate any media errors.
Given that the length of the resulting file is *less* than that of the
original ISO, I suspect that there is a problem with the recording. If
you got a resulting file that was *bigger* than the original ISO then
that might not be an issue, as you could have read back some of the
lead-out data after the end of the filesystem; as long as the files are
identical up to the length of the original ISO, all should be OK but
that's not the case here.
Paul.
