text: 18.When finalized, the image-mode copies of the volumes are deleted and the associated 
  MDisks are removed from the migration pool. The status of those MDisks returns to 
  unmanaged. You can verify the status of the MDisks by navigating to**Pools**→**External**
  **Storage**, as shown in Figure 9-19. In the example, mdisk3 was migrated and finalized. It 
  appears as unmanaged in the external storage window. 