I briefly mention DMGs (pages 589-590), but due to the page constraints of an already large book, I had failed to delve into their format sufficiently. I realized, however, that the DMG file format (being Apple proprietary) was woefully undocumented. AboutĪs part of writing HFSleuth, a 'bonus' tool for my book, I decided to implement DMG (disk image support). DeMystifyinG the DMG file format Demystifying the DMG File Format Jonathan Levin, - 6/12/13 1.