Unraid OS version 6.9.0-beta29 available in Prereleases Posted September 29, 2020 19 minutes ago, trurl said: 4KiB 2 minutes ago, limetech said: Likewise confused - did you manually re-paritition those HDD's? If so you can leave them as-is if you want as long as they're not assigned to parity since they are slightly smaller as you indicate. If you want to re-partition, it is necessary to either unassign parity disk(s) or go to Tools/New Config and unassign that way. Now, with array Stopped you should be able to click Erase button for each of those devices. Upon next array Start they will appear Unformatted and subsequent Format will create default partition layout for an HDD (4KiB aligned). Thank you both.