![]() If the system could get this to work automatically, I don't see why manually invoking it would help. Listing some number of deleted snapshots. If this succeeded, it should say something like Thinned local snapshots: This requests Time Machine to automatically clean out enough snapshots to free a desired amount of space, in this case, 100 GB. Deleting a file of X bytes would increase the size of this "hidden space" by X bytes.įirstly, I would try to manually thin out the Time Machine snapshots. Daisy Disk reports a large "hidden space".Deleting files doesn't increase free space on the disk.However, this process failed, as we'll see below. Under healthy operation, old snapshots are deleted as necessary whenever new disk space is required. The root of this issue seems to be a failure in deleting APFS snapshots made by Time Machine. Then again, you know that, you voluntarily installed a beta operating system. DO NOT PROCEED WITHOUT A BACKUP OF YOUR DATA. Hope you this article will help you out the trouble.This seems to have worked fine for me, but there are no guarantees. You can follow them one by one to make your unmounted DMG file accessible again. The fixes mentioned in this post are testified useful for resolving the issue. When you run into this problem, it doesn't mean that you can't access the DMG files anymore. No mountable file systems." is very common in daily life. The macOS error "The following disk images couldn't be opened. Some bugs pop up during the operating system recognizing the DMG file.The format of the DMG file is corrupt or not compatible with your Mac OS.When a Disk Image is not mounted on your Mac, the most common reasons are as below: The unmountable issue of Disk Images is just like that of hard drives, which is also related to the OS and the file format. Why does the 'No mountable file systems' error occur on Mac? Therefore, you can also check your security settings to enable the DMG mountable on your Mac. Moreover, some users even find that the security policies they set will make the DMG file can't be mounted on Mac. If it is, the DMG file is mounted successfully. Now, you can check whether the DMG file shows up on your desktop or Finder. 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 a temporary bug in your operating system. So, it feedbacks you on 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'? And then, you can access all data on the DMG file. ![]() This article will show you what 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. ![]()
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