md5sum on CD

[John Vetterli]

On Wed, 23 Nov 2005, D. Hugh Redelmeier wrote:
> But there is another problem that you might well be hitting.
> See, for example:
>  https://www.redhat.com/archives/fedora-list/2005-March/msg02774.html
>  https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=151088
> The Linux IDE CD driver in 2.6 tries to read ahead, even past the end of the
> CD or DVD.  Even when the program issuing the original read request was only
> trying to read legitimate parts of the disc (albeit near the end).
> The result is spurious I/O errors and read failures.
> It does not seem that this driver bug is going to be fixed soon.
> To work around this problem ...

mkisofs has a -pad option that adds padding to the end of the iso image, 
to work around this problem.

You can also try to read back the disk using readcd instead of dd; I think 
readcd works around the problem as well.

HTH
JV
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