/Mount-Image /ImageFile: {/Index: | /Name: } /MountDir: /ReadOnly /Optimize /CheckIntegrity Mounts the image to the specified ...

/Mount-Image /ImageFile: 
  {/Index: | /Name:} 
  /MountDir: [/ReadOnly] [/Optimize] [/CheckIntegrity] 

  Mounts the image to the specified directory so that it is available for 
  servicing. 
  Use /Optimize when mounting an image to reduce initial mount time. 
  Use /CheckIntegrity to stop the operation if WIM file corruption is detected.
  Use /ReadOnly to set the mounted image to have read-only permissions. 

    Examples: 
      DISM.exe /Mount-Image /ImageFile:C:\test\images\myimage.wim /Index:1 
        /MountDir:C:\test\offline 

      DISM.exe /Mount-Image /ImageFile:C:\test\images\myimage.vhd /Index:1 
        /MountDir:C:\test\offline /ReadOnly