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How To read disk from dead Zyxel NAS

I have the harddrive fra a Zyxel NAS. The NAS is dead, but the harddrive seems okay. How can I access it? If I mount it in af USB harddrive case, Windows can see the disk in Disk Manager, but Explorer can’t read it.
I have tried to install Oracle VirtualMachine with Ubuntu, but that can’t read it either.

Any good ideas?