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Fix Mac Error No Mountable File Systems

This information write-up helps you to fix the No mountable file system Mac error with the help of free methods given.

Has anyone seen this? When trying to mount a dmg (disk image) file, getting the very odd error - "no mountable file systems" on Mac system. Well, here’s what to do

Though the Mac systems are the most secure computers, there are chances that you might face No mountable file system in Mac machines anytime. The no mountable file systems Mac error can cause the computer to work slow or frequent unexpected problems. When this error occurs, you may not be able to access your Mac hard drive or the applications which you have installed on your system

If you are facing Mac error no mountable file systems, then you don’t need to panic. Your mac system will start running slow and sometimes, the hard disk becomes inaccessible. However, you can fix this Mac error no mountable file system with few free methods that are given below.

Why Does “No mountable file systems” Occur on Your Mac?

The above-said error can be caused by various reasons creating a panic situation in your mind. Here are some few of them:

  • Accidentally deleting any Mac files
  • Power failure
  • Read/Write operation interruption
  • Unsupported data
  • Virus attack
  • Improper changes in EFI (Extensible Firmware Interface)
  • Header file corruption
  • Corruption of catalog files node
  • Boot sector problem
  • Issues in program installations, etc.

How to Fix No Mountable File Systems Mac Error for Free?

If you are facing Mac error no mountable file systems problem, follow these steps:

  1. In most cases, the downloaded disk image file is corrupt or had an error while downloading. If possible, try downloading the dmg file again after turning off any download assistant plug-ins you may have.
    You can try downloading the file in a different browser as well. You can also try curl -O url in Terminal to download the file.
  2. Reboot your Mac if you haven't already tried that. Apparently, if there are too many dmg files open, the no mountable file system Mac error is caused.
  3. Disable if you have enabled any restrictions that need permissions or prevents accessibility to external drives (thumb drives, optical drives, etc.).
  4. Try mounting the disk image file in the command line in Terminal. We will at least get some sort of useful error message to go on if it still fails. Follow the steps given below to know how you can mount the disk image in Terminal.

How to Mount Disk Image File in Terminal?

Step 1:In Spotlight, search for Terminal and press enter to open the Terminal app.

Step 2: Type or copy-paste hdiutil attach in the terminal but, do not press enter yet

Step 3: Drag and drop the dmg file from your Finder window onto the Terminal window.

Step 4: This will fill in the location of the dmg file into your Terminal window and hit enter once the location is filled.


Trying to fix No mountable file systems Mac error needs a lot of technical knowledge. Any miscalculation or entering improper values may lead to data loss from your Mac. If the user does not possess any technical knowledge, It is always recommended to make use of a Mac data recovery software.

This will help to recover data from the inaccessible Mac and fix the mac error no mountable file systems problem by formatting the system.

Software to Recover Data after Facing No Mountable File Systems Error on Your Mac.

If you are suffering from Mac data loss, then Remo Mac data recovery Software can solve your problem. This is a simple, reliable, and easy to use tool which will recover your lost Mac data in no time. This tool can recover corrupted data from both external and internal drives on Mac. It scans the whole drive with its powerful algorithm and recovers all lost files and partitions very easily. You can easily use this tool to recover deleted or lost Mac files. The tool is also compatible with various macOS versions such as Catalina, Mojave, High Sierra, etc.

You can perform Mac data recovery on your system effortlessly with the help of Remo Mac Data Recovery software. This tool is built keeping in mind the most novice users. The self-explanatory interface lets you get back Mac data without any hassle. The tool can also be used to recover lost Mac partitions from various file systems like HFS, HFS+, and APFS partitions. Make use of the Remo Mac data recovery tool and get your job done in a few simple steps.


Recover Data After Encountering No Mountable File System Error:

(Follow the steps mentioned below if you want to recover data after encountering No Mountable File System error.)

Download, install and launch Remo Recover Mac on the affected Mac system.

Step 1: Select Recover Volumes/ Drives from the main screen and click on Volume Recovery from the following screen.

 Recover Data after Facing No Mountable File Systems Error on Your Mac

Step 2: Check if the error encountered drive is listed. If not, then select the option given at the bottom of the software window and click on Next.

Recover Data After Encountering No Mountable File System Error

Step 3: Select Advance Scan option as the Standard Scan option cannot recognize the data that is present within the No mountable file system error encountered drive.

Step 4: Skip this option if you want to recover all of the data present within the inaccessible drive. Or, you can select only the important files and click on Next.

Step 5: Once the software has completed scanning the inaccessible drive, click on a file, and select Preview to verify the file before saving the recovered files.

Note: Do not save the recovered files on the same drive from where the data has been recovered. Save it on any other desired location.

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John Harris

Senior Editor, Content Analyst and a fan of exceptional customer service. John develops and publishes instructional and informational content regarding partition management, Windows hot-fixes, data management and computer troubleshooting.

As a tenured data recovery specialist, John shares exceptional insights and blog posts about data loss and data recovery across any storage device. With 8+ years’ experience in writing for Data Recovery for both Mac OS and Windows OS computers, he is an avid learner who always wants to polish and simplify the data recovery process. John passes his free time playing Chess and reading Science Fiction novels.

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