Mac disk image not recognized

Ask Different is a question and answer site for power users of Apple hardware and software. It only takes a minute to sign up. I created a disk image from a folder using disk utility and now when I double click it to open it i get an error message saying image couldn't be opened. Image not recognised. What can I do?

How to fix an external disk drive that won't show up on a Mac

Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. File systems are not routinely checked in all disk images, only those which have a quarantine flag attached and have not already passed an fsck check are put through the process.

When it does, it then adds an extended attribute of type com. You can force macOS to bypass the fsck step using a command in Terminal of the form hdiutil attach filename.

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Any failure at this step might still allow you to install an app, but for it to undergo app translocation. If not, and macOS barfs at any attempt to use the disk image, there is nothing that you can do with that disk image; you will need to obtain a new one with a correct signature or none at all. A common suggestion which appears repeatedly is to remove extended attributes from the disk image. Although this might have worked in the past, it will not solve the problem in recent versions of macOS.

However, if you want to try it, you can do this using xattred from Downloads above or in Terminal with a command like xattr -d com. These remove the fsck xattr and the checksum xattr respectively. You might also try removing any com. At least in the first instance, you might be best treating it as hostile until proven innocent.

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Skip to content Disk images are normally both robust and reliable, but every once in a while they can cause problems. Please help me. I checked the latest steam dmg and it mounts ok on my High Sierra machine.

A few "silly" things to try, just in case it's a simple corrupt dmg or system reboot kind of problem: Try downloading it on the terminal with curl as described in the post, as well as rebooting your mac. Are you willing to post the output from hdiutil attach -verbose? Also, is it a publicly available DMG that can be downloaded to test on my end, or one of your own? Sadly, all I've been able to find in my research about this specific form of failure is to try rebooting and try redownloading the DMG. The places where I've seen the error, the person reports that it was transient and the DMG worked fine later.

Try the hdiutil command again, making sure to do two things: 1 Add a space after attach before the dmg file name. That will fill in the DMG filename, making sure the spaces are done correctly, just in case. Can you paste the entire output from hdiutil, as well as let me know what version macOS you're running? Those two lines aren't enough to know. Ah, hmm interesting! I see the email, and I'll be taking a look at this verbose log shortly!

Will followup via email as soon as I can. And hopefully we can post the end result answer here as soon as we figure it out! Hi Kelly could you please send me the answer for this particular case? Cuz I'm having problem exactly the same as his, all steps and messages.

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But we did make some progress using advice from this thread:. But, definitely do this on a COPY, and I would try the first post with instructions to attach and mount separately first. This is what hditutil says for me for the latest version of VirtualBox, but I encountered the same problem for other images.


It doesn't look like an APFS problem? Any idea what it could be? Thank you. What version of macOS are you running? I can try it on my end assuming I have a similar machine to do it on.

The following disk image(s) failed to mount, 'not recognized.'

My High Sierra machine mounts it ok. Also if you didn't try rebooting yet, I'd try that now. Hi Kelly, macOS Yes, I tried rebooting. What's frustrating is that it used to work just fine.. Anyway, don't worry about it, I was just wondering if it was something obvious. Thank you for taking the time to have a look and to answer me. I'm getting a "no mountable file systems" message for the wxHexEditor install image. How should I proceed? Thanks for the reference to the DMG. The error message is the same as if the DMG was broken, but in this case means hdiutil can see the partitions and everything looks ok, but macOS This could be because you're running an older version of MacOS.

Then I tried on my side computer which is updated to High Sierra.

Disk Image can't be open Because it is not recognized? | Mac Support

The disk image opened fine. Looking the output of the mount command, it turned out that the disk image contained an APFS partition which is not supported by El Capitan. I got error form suggestion 3. If it's a DMG that is publicly available, can you send us an email via our support form and let us know where we can download it to see if it's a damaged DMG?

Also, what version of macOS are you running? If you want, you can run the terminal command from suggestion 3 and send us the error it prints out via our support page so we can take a look. Hope this helps! That's interesting - I haven't seen this specific error from the disk image signing before, so that is a good new tip to check! Thank you for letting us know! Decipher Media makes Decipher Tools software to address common iPhone, iPad, and iPod needs like documenting text messages, photo recovery, and fixing broken iPhone backups.

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