> As remounting fixes the problem, I think it doesn't have to do anything 
quoted text
> with the IDE driver, right? The device node should always be connected 
> with the physical device, even if unmount. So the "problem" seems to be 

The IDE driver handles retries, although for IDE the drive itself also
handles them too by default.

quoted text
> So the question is: What exactly will this "ISO 9660 driver" do, if 
> there is a read error? Will it mark this "failed byte" as "unreadable" 
> and will never try again, or will it try again for at least one ore more 
> times?

It knows nothing about retry - that happens lower down.

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