and then in the 'Convert' window that will appear, make sure you tick the ISO checkbox, set the destination save file path and hit OK to save the ISO file. Using PowerISO: Open the DMG file in PowerISO, then select TOOLS menu > CONVERT. How to Convert DMG Files to ISO Files on Windows for free - Download Mac OS X ISO to Installing Mac OS in Windows using Virtualbox. Pull down the 'Image Format' menu and choose 'DVD/CD master', then click 'Save'.

dmg image from the sidebar list and then click the 'Convert' button in the toolbar.

Launch Disk Utility (found in Applications > Utilities).

Mount the DMG disk image you want converted to CDR format by double-clicking it in the Finder.You can't, unless the DMG files are uncompressed (rare) in which case you would use Toast 5 Titanium to mount the DMG file and then you'd make a new Toast disk image of that mounted volume, but don't count on it, because most DMG files cannot be mounted under classic Mac OS. So if you're stuck with a DMG file and would like to convert it to ISO in order to feed it to a disk image burner/cloner app (or to 'dd') then follow these steps: using 'dd' under OSX or using HDD Raw Copy under Windows) because they are compressed. CDR under Mac OS X) disk image format is universally supported, therefore it's a much better choice for storing files or making a disk image backup.ĭMG files also cannot be directly cloned (e.g. The fact that the DMG disk images are compressed poses a compatibility problem to most Windows users and earlier Mac OS versions, e.g. DMG files are disk images that are compressed using Apple's proprietary format and Mac OS X default disk image format.

Os x change dmg to iso