afarhan3
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afarhan3's post in Cleared disks that is mountable outside of the array is unmountable when added to array with no option to format was marked as the answerJust Solved the problem for anyone wondering.....
I stopped the array and removed disk 8 from the array so it showed up in unassigned devices. If there is an 'x' on the drive allowing you to clear the disk, click that. Otherwise, go to the terminal and use fdisk /dev/sdX, where X is your drive. Then enter d to delete any partition, and enter w to write the results. After this, your disk should be available to format under unassigned devices. Click "Format" (it may work immediately or may prompt you to enable destructive mode under the unassigned devices settings). Enable destructive mode, and you can now format your disk to XFS. Then add the disk back to the array.
Note that the file system might be set to "auto," so be sure to click on the disk, go to disk settings, and set the file system to XFS to match the format you applied to the drive. Start the array, and that should resolve the unmountability issue you experienced before.