Error message while copying a hard disk to a latest disk image

Hello,
When I try to copy a hard disk to a latest disk image, I get this error message – "The image creation procedure failed".
However, I am able to navigate, mount, and apply files on the disk icon, and the archive and original disk sizes are similar; but the error recommended is reporting a trouble.
Is there any technique of verifying whether all the files did actually, get archived?
Also, I intend to present logs.
Please help.
Thanks a lot!
