anchor.diff:  
   Both services offer a single plan called `Existing`.
   
  +<p class="note"><strong>Note:</strong> NFS is not available on Windows systems.</p>
  +
   ### <a id='create-nfs'></a> Create an NFS Volume Service
   
   To create an NFS volume service using the `Existing` plan of the `nfs` service:
  
positive.code: In <%= vars.app_runtime_full %>, a volume service provides a volume so your app can read
  or write to a reliable, persistent file system.
  
  <p class="note"><strong>Note:</strong> NFS and SMB volume services are available for Linux cells only. These services are not available for Windows cells.</p>
  
  
  ## <a id="pre"></a> Prerequisite
  
negative.code: 
  This section describes how to use a Server Message Block (SMB) volume service. For more information about SMB volume services, see [Microsoft SMB Protocol and CIFS Protocol Overview](https://docs.microsoft.com/en-us/windows/desktop/fileio/microsoft-smb-protocol-and-cifs-protocol-overview) in the Microsoft documentation.
  
  <%= vars.external_vol_smb_note %>
  
  ### <a id='create-smb'></a> Create an SMB Volume Service
  
  <%= vars.app_runtime %> offers an `smb` volume service.
  