text: Figure 12-75 Drive encryption state 
  
  **12.8.4 Encrypted MDisks**
  
  For more information about how to add external storage to a pool, see Chapter 6, “Storage 
  pools” on page 191. Each MDisk that belongs to external storage that is added to an 
  encrypted pool or child pool is automatically encrypted by using the pool or child pool key, 
  unless the MDisk is detected or declared as self-encrypting. 
  
  The user interface gives no method to see which extents contain encrypted data and which 
  do not. However, if a volume is created in a correctly configured encrypted pool, all data that 
  is written to this volume is encrypted. 