[Answer ID: 14970]
What should I do when I don't see "Rebuild RAID array" in Settings to rebuild the RAID array?
Formatting a new hard drive will automatically mount it as a single unit and it can not be mounted or rebuild as a RAID drive. To fix this, follow the steps below.
In LinkStation’s settings, navigate to [System] – [Storage], select the new drive, and click [Remove Disk] to dismount it.
Physically remove and reinsert the drive.
Now, you are able to rebuild a RAID array.
Navigate to [System] - [Storage] - [RAID Array], highlight the RAID array, and click [Rebuild RAID array].
For more details on how to replace a hard drive and rebuild a RAID array, click the link below.