Jul 20, 2017 Most macOS applications downloaded from outside the store come inside a DMG file. Double-click the DMG file to open it, and you’ll see a Finder window. Often these will include the application itself, some form of arrow, and a shortcut to the Applications folder. By default, your Mac won’t open any software made by “unidentified.
If I were you I would ignore the dmg problem until you fix the higher priority problem of the disk errors. Maybe fixing that will fix the dmg problem and I'm guessing almost certainly the spinning cursors.
Ways of Opening a DMG File in Windows: DMG Extractor (Free and Paid): The best and the most professional tool for opening a DMG file in Windows is DMG Extractor.It can open a variety of Disk Image Files and it also demolishes the need to convert the DMG file to ISO for use in Windows. Dmg files aren't supposed to expand, they are disk images. They mount and show up just like if you had plugged in a USB drive. The DMG format replaces the older.IMG file format used in Mac OS Classic. DMG disk images can be opened using the Apple Disk Utility that is bundled with macOS on Apple computers. DMG files are Mac-specific and are not intended for use in Windows. However, Windows Daemon Tools may be able to mount virtual drives from some DMG image files. You can't extract more than 5 files from a DMG simultaneously, and it simply won't work with encrypted files or those bigger than 4 gigabytes. DMG files are mounted by your system, like a sort of virtual hard drive. When you’re done installing the application, it’s a good idea to unmount the DMG in Finder when you’re done installing: just click the “Eject” arrow. Then you can feel free to delete the original DMG file: you don’t need it anymore.
As I understand it Lion drives are formatted with a special 'recovery partition' which takes the place of the separate bootable installation disks. It contains a copy of Disk Utility. Read the following on how to use this partition.
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By the way, if you are using Lion you should update your sig.
How To Open Dmg File On Mac
Dec 12, 2011 10:58 PM