Fix no mountable file systems Mac

I’m trying to open an dmg file in my Mac but it shows “No mountable file system” error. At first, i thought the file is corrupted during the transfer so i re download the file again. However, it still shows “No mountable file system” error when i open the dmg file.

After some research, i found a small command will solve the problem.

Mac open dmg file: No mountable file system

• Backup your dmg file
• Open your terminal
• Enter this command:-
  hdiutil convert /path/to/yourfile.dmg -format UDRW -o newfilename.dmg
• Once you execute the command, sit back and wait till the process finish. (It might need to take some time if your file is very large in size)
• Once the process finish, double click on your newfilename.dmg file and you will be able to open the file

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Tags: dmg no mountable file system, mac os x no mountable file system, no mountable file system, no mountable file system error, open dmg no mountable file system

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Question:

Question: no mountable file systems

After the OS upgrade to Catalina, I'm unable to run any dmg file. As soon as I double click on it, gets the error message dialog box:

Warning

The following disk images couldn't be opened

Reason: no mountable file systems

I tried different dmg files but no luck and same error.

Posted on Dec 6, 2019 10:55 AM

Answer:

Answer:

A Troubleshooting Procedure that may Fix Problems with macOS El Capitan or Later

You should try each, one at a time, then test to see if the problem is fixed before going on to the next.

    Be sure to backup your files before proceeding if possible.

1. Shutdown the computer, wait 30 seconds, restart the computer.
2. Disconnect all third-party peripherals.
3. Resetting your Mac's PRAM and NVRAM
4. Reset the System Management Controller (SMC)
5. Reset your Startup Disk and Sound preferences, if needed, after resetting the PRAM.
6. Test in safe mode to see if the problem persists, then restart normally.  Use safe mode to isolate issues with your Mac and Playing Safe - what does Safe mode do?
7. Repair the disk by booting from the Recovery HD. Immediately after the chime hold down the Command and R keys until the Utility Menu appears. Choose Disk Utility and click on the Continue button. Select the indented (usually, Macintosh HD) volume entry from the side list.  Click on the First Aid button in the toolbar. Wait for the Done button to appear. Quit Disk Utility and return to the Utility Menu. Restart the computer from the Apple Menu.
8. Repair permissions on the Home folder: Resolve issues caused by changing the permissions of items in your home folder.
9. Create a New User Account Open Users & Groups preferences. Click on the lock icon and enter your Admin password when prompted. On the left under Current User click on the Add [+] button under Login Options. Setup a new Admin user account. Upon completion log out of your current account then log into the new account. If your problems cease, then consider switching to the new account and transferring your files to it - Transferring files from one User Account to another.
10. Reinstall OS X by booting from the Recovery HD using the Command and R keys. When the Utility Menu appears select Reinstall OS X then click on the Continue button.
11. Erase and Install OS X Restart the computer. Immediately after the chime hold down the Command and R keys until the Apple logo appears. When the Utility Menu appears:

     1. Select Disk Utility from the Utility Menu and click on the Continue button.

     2. When Disk Utility loads select the drive (out-dented entry) from the Device list.

     3. Click on the Erase icon in Disk Utility's toolbar. A panel will drop down.

     4. Set the Format type to APFS (for SSDs only) or Mac OS Extended (Journaled.)

     5. Click on the Apply button, then wait for the Done button to activate and click on it.

     6. Quit Disk Utility and return to the Utility Menu.

     7. Select Install OS X and click on the Continue button.

Posted on Dec 6, 2019 12:48 PM

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