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Badly scratched medium.
This medium has been carried around without protection in a backpack;
the round prints were made by a bottle of water. The scratches are
a bit exaggerated due to reflections from the photoflash.
A surface scan of the medium yields about 135.000 unreadable sectors
(of 2.200.000 total, giving about 6% defective sectors).
During the recovery of the medium image
(using standard settings)
a maximum of 22 errors per ECC block is counted
which equals to a 69% load of the error correction under the applied settings.
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