- Accidentally deleting any Mac files
- Power failure
- Read/Write operation interruption
- Unsupported data
- Virus attack
- Bios setting modifications
- Header file corruption
- Corruption of catalog files node
- Boot sector problem
- Issues in program installations, etc.
- In most cases, the downloaded dmg file is actually corrupt or had an error downloading. If possible, try downloading the dmg again, turning off any download assistant plug-ins you may have. You can try downloading the file in a different browser as well. Or if you don't need to be logged in to the site to download the file and you want to be fancy, you can try curl -O url in Terminal to download the file.
- Reboot your Mac if you haven't already tried that. Apparently, there is an issue sometimes after opening too many dmg files, that is fixed with a reboot.
- Try mounting the DMG on the command line in Terminal. We will at least get some sort of useful error message to go on if it still fails:
- Open Terminal: In Spotlight, the search magnifying glass at the upper right corner of your screen, search for Terminal, and press enter to open the Terminal app
- Type hdiutil attach into the terminal. Don't press enter yet
- Drag the dmg file from your Finder window onto the Terminal window and let go. This will fill in the location of the dmg file into your Terminal window
- Press enter
- Think about if you have any kind of security policies on this machine to prevent writing to external drives (thumb drives, optical drives, etc.).
Are you facing ‘no mountable file system’ error?
How to fix ‘dmg no mountable File System’ error?
Why DMG file becomes inaccessible?
DMG (Disk Mounted Graphics) is a file used on Macintosh Operating System X. It is just like an image which contains all contents of the ‘File system’. Its format allows file compression of the data with password protection. You can easily create DMG file by the Disk Utility of the Mac’s OS with extension ‘.dmg’. Sometimes when operating system mounts (It is the process of making computer file system ready to use) this DMG file it throws an error message ‘No mountable File System’.
This error arises when OS do not get the file system in proper format to mount. In this situation file system either damaged or missing. Because of this reason you can not access DMG file and you have to face data loss situation. To tackle this problem your system required a Data Recovery Software that can recover your all lost data. Mac Data Recovery Software is the best choice in this case.
Os X Dmg No Mountable File Systems
Mac Data Recovery software can recover your lost, deleted, formatted and corrupted data from Memory cards, Apple iPods, Macintosh hard drives etc. The application of this recovery software use powerful scanning algorithms to perform in-depth scan of entire hard drive so that it can extract all lost, missing, and inaccessible data. Its user friendly interface allows you to recover all data easily. It doesn’t demand for any technical skill.