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DiskImageMounter error message opening image files on Time Capsule

After upgrading to 10.12.2 I get the following error message when I try to open image files with a double-click on my Time Capsules: "The application "DiskImageMounter" can't be opened. -36"

The error does not occur when I open local images only with images on the Time Capsules. Same error with .dmg, .sparseimage or .sparsebundle files.

Posted on Dec 14, 2016 1:05 PM

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71 replies

Jan 15, 2017 8:50 AM in response to wagnerlix

I keep all my music and movies on my TC and was having the same issue trying to access them. Finder would show my TC under the Shared tab but I was still unable to open it without having that DiskMount error appear...


ALL I DID was play a song on my iTunes that its file is on my TC, and all of a sudden the TC popped up for me to access. It took a couple of seconds to load, but it works.


Quick fix for me worked, just open a file with its origin being on the TC.

Dec 14, 2016 1:17 PM in response to wagnerlix

That appears to be normal behavior in Sierra, and if I had to guess it is intended to enhance security. Copying the sparse disk image bundle from the network volume to a locally mounted volume, and then mounting it, will work.


Assuming you want to make changes to that disk image, make your changes on that local volume, then copy the image back to the TC. That works.

Dec 14, 2016 1:57 PM in response to wagnerlix

The main problem is, that I stored a 1 TB sized Sparse Image File in which I make a lot of daily changes on the TC.


Unless I am mistaken, you can no longer do that. I don't know why, or if it is intentional. All I know is that I can no longer mount a TM-resident disk image.


To make changes, the disk image must first be copied to a locally mounted volume. That works.

Dec 14, 2016 6:10 PM in response to wagnerlix

I also see this behavior and don't believe the other responses are correct (respectfully). If you can place any other data type on a time capsule volume with 10.12.2 and see if it opens like a PDF, JPG, etc. Since 10.12.2 on 4 machines I have none of them will open with normal Finder double clicks with AFP. If I connect with SMB they will open fine. Oddly preview does actually show previews. I still have 1 machine that is 10.12.1 and it continues to open any file type normally on a time capsule volume.


Something clearly has changed and not able to figure it out yet.

Dec 15, 2016 8:45 PM in response to wagnerlix

Same here. I had (for the first time ever) Apple Support on the phone. At first Junior, then Senior support, I might mention. Finally the suggestion was to reinstall (10.12.1) and see if the problem is gone - he would call me back the next day. So I did:

- Reinstall (back to 10.12.1) which fixed the problem (of course I might say after reading this thread)

- Right after reinstalling, I upgraded again to 10.12.2 - problem was back

- Reinstalled again to have it working.... Stay there for now.


While sitting on hold, I tested creating som dmg- and sparsebundles-images and moved them back and forth... confirming what John Galt says about beeing able to open them locally. I was lucky enough to have 2 Time Capsules and 2 Macs (1 new MBP 2016, 1 MBP 2014 with ElCapitan) around me, so I could already narrow down the problem to the 10.2.2-upgrade.


When support called me the next day, I reported back and he said I should stay in 10.12.1 for the time being and he will take this issue further and they might call me back for more information.


Bottom line: there was not a hunch that this was intentional (or the support guy wasn't quite updated on this one). Neither does, in my opinion, the type of error message you get.

rtm808: Where is the "Like"-button for "...this is a bug, not a feature"?

Dec 15, 2016 11:40 PM in response to wagnerlix

FWIW, I may be missing something (it happens) but here's what I tried. I downloaded a graphics program I wanted to try which came as a .dmg file. I copied it to my Time Capsule, dbl-clicked on the file and it mounted fine. This was with a MBA running Sierra 10.12.2. I also mounted it on the Time Capsule from an iMac running .


So I'm not seeing the same problem.

<Edited by Host>

DiskImageMounter error message opening image files on Time Capsule

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