

Drag the DMG file from your Finder onto the Terminal window to fill in the location of the DMG file into your Terminal.Type the following command in Terminal and add a space.Double-click Terminal in the recommended results to open it. Search for Terminal in the Spotlight Search box at the upper right corner of your screen.If the above simple tricks can't help you mount and open the Disk Image, you can try to mount it using the command in Terminal. And if your Mac runs macOS 10.12 or earlier, you can upgrade your macOS version to check if the error can be fixed. If yes, the DMG maybe only Windows-compatible. You can download the DMG on a Windows PC to see if it can be opened. Besides, macOS Sierra (10.12) and earlier don't support APFS.

Usually, Mac OS is only compatible with APFS, HFS+, exFAT, and FAT32/16 while read-only on NTFS drives. If the format of the downloaded DMG is not compatible with your Mac, it can't be mounted. It is also formatted with a file system before storing data. The Disk Image is a type of virtual drive. Solution 3: Check the file system of the DMG You can try to reboot your Mac to check if it is just caused by the temporary bug of your operating system. So, it feedbacks you the error message "No mountable file systems" when you click the DMG. Sometimes, the Mac OS detects the DMG file but fails to recognize its format. Note: To check the DMG download URL, right-click it in Finder and click Get Info > More Info > Where from. Solutions for fixing "No mountable file systems" on Mac: You can troubleshoot this error by trying the ways below one by one. So, there are several solutions for resolving the problem. The causes of the error vary as there are different scenarios. How to fix the error 'No mountable file systems'? Mostly, it is a corrupted dmg file or the operating system fails to recognize it. The error "No mountable file systems" showing up on your Mac indicates that the disk image (or dmg file) cannot be mounted and opened. What does it mean when Mac says 'no mountable file systems'? Why does the 'No mountable file systems' error occur on Mac?

And then, you can access all data on the DMG file. This article will show you what does this error means and how to fix the "No mountable file systems" error on your Mac. The following disk images couldn't be opened.

However, the target DMG file doesn't open this time but pops up an error message like the following: Usually, when you double-click a dmg file (Disk Image), it will mount and open automatically.
