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For some drives, like those previously used in mdraid arrangements previously, you may have to take extra steps before they can be used within Rocksor. This is a short-fall on our part and we have the following doc issue open to address this:
Feel free to post more info about what lead to this error. If your drives were previously used with mdraid this may well be the issue. It would also help to have pasted in there the cmd that threw the error. It should have been visible on the screen at the time and if you still have this issue then pasting that in here will help others help you resolve this.