When I try to unmount I get the following error message as shown in attachment.Well that looks ok to me, is that after pressing blue button and looking at mount from there, have you just for shits and giggles tried to unmount it and then initialise again, I don't have a zgemma with me I just set them up for people, did you also reboot like Wooshman said
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This box has had more reboots than a Superman movie franchise! I'm going to reinitialize USB stick, reboot and see what happens.

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