Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.

J:\chds\cubeqst>chdman copy -i cubeqst.chd -o newcubeqst.chd
chdman - MAME Compressed Hunks of Data (CHD) manager 0.145u1 (Feb 19 2012)
Output CHD:   newcubeqst.chd
Input CHD:    cubeqst.chd
Compression:  avhu (A/V Huffman)
Hunk size:    380,496
Logical size: 41,096,611,968
Compression complete ... final ratio = 27.9%

J:\chds\cubeqst>chdman verify -i newcubeqst.chd -f
chdman - MAME Compressed Hunks of Data (CHD) manager 0.145u1 (Feb 19 2012)
Error reading CHD file (newcubeqst.chd): decompression error

J:\chds\cubeqst>