Solutions
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dangerous-introduction6523's post in Unable to mount CACHE disk | Unmountable: Unsupported or no file system was marked as the answerWow! with unassigned devices it wasn't working but with at simply mount -o loop cache1.iso ./cachemount/ i was able to mount the image and i'm copying the data right now!!!
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Will do more tests with the drive, because apparently it has no errors, and also next time configure properly the cache disk! One to learn the hard way