The degree of compression achieved with a Ghost 9/Ghost 10 image may be determined at any time using the following procedure with Windows Explorer.

• Step 1:  Navigate to the file containing the recovery point (e.g., C_Drive.v2i), and record its size (denoted by 'X').
  
• Step 2:  Mount the image by right-clicking the file name (e.g., C_Drive.v2i) and choose “Mount”.
• Step 3:  Right-click the name of the drive from Step 2 and select “Properties” to display the Used Space (denoted by 'Y').
  • Note:  For a more accurate compression estimate, subtract the size of \Hiberfil.sys and \Pagefile.sys, since these two files are only represented by ‘placeholders’ in the Ghost 9/Ghost 10 in the recovery point (Norton Ghost 10.0 User’s Guide, page 57).
• Step 4:  The quantity 100*(1-X/Y) yields the percent compression.

To retrieve the compression level (e.g., High/Medium/Standard/None) that was used by Ghost 9/Ghost 10, open the recovery point using the Recovery Point Browser, select the recovery point (not the name of the drive) and view its properties (i.e., File -> Properties menu).

Symantec estimates the following levels of compression (Norton Ghost 10.0 User’s Guide, pages 61-62):

• Standard:  40%
  
• Medium:  45%
  
• High:  50%

Nice formula Pleo.

Removing the pagefile from the C drive used space gives a compression of 49%. I used High compression. Being lazy and not removing the pagefile gives a compression pf 53%. As you point out, the former figure is more accurate.

I don't use hibernation.