Replaced drive on the TeraStation and still receiving a RAID error

After you replaced a drive, you need to restructure array onto the new drive.
Check to make sure user restructured the RAID array onto the new drive.

To do this:

1. Go to Disk Management->RAID Configuration and click on RAID Array 1 (or RAID Array 2 if second Array failed in Mirrored Mode).
2. Check the drive number that was replaced (Important: the others should be grayed out and checked).
3. Choose Restructure Array.
4. This should generate a warning that states the "Target Disk(s) will be reformatted".
   This is OK, it only applies to the replaced drive.  The device will then recreate the RAID array onto the new drive.