Removing free space in DMG file

I have a 7GB .dmg file that I'm trying to burn to a DL DVD. When mounted (and in Disk Utility), the file shows as having 1.2GB of free space. If I try to burn it in Toast 10 or Disk Utility, I get an error saying that my blank DL DVD can't fit the 8.2GB file, even though it only contains 7GB of actual files. How can I "delete" the free space in this .dmg file so that it will fit on a dual-layer DVD?

Peter Petracca wrote:
I have a 7GB .dmg file that I'm trying to burn to a DL DVD. When mounted (and in Disk Utility), the file shows as having 1.2GB of free space. If I try to burn it in Toast 10 or Disk Utility, I get an error saying that my blank DL DVD can't fit the 8.2GB file, even though it only contains 7GB of actual files. How can I "delete" the free space in this .dmg file so that it will fit on a dual-layer DVD?
What's interesting is that a blank DL DVD has a capacity of 8.5 GB.

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