If you’ve ever downloaded an application from anywhere other than the Mac App Store, then it’s likely it came packaged as a compressed disk image. That’s a very useful and convenient way for developers to make applications available and works very well, most of the time. Occasionally, however, you may see a message telling you that ‘the following disk images could not be opened…’ That usually happens because the disk image is corrupt. Here’s what to do if that happens. Show What is a disk image?A disk image on Mac is a file format that mimics a physical disk. Like physical disks, it can be mounted in Finder, where it looks like any other volume, have files and folders copied to and from it, and can be cloned or burned onto physical media like a CD or DVD. Disk images are ejected in the same way as physical disks and show up in Disk Utility. You can also use Disk Utility to create disk images of your own. Disk images were originally used to distribute software remotely because the resource forks used by Mac applications couldn’t be transferred easily over networks like the internet. The introduction of Mac OS X meant resource forks were no longer used; however, disk images are still a popular way to distribute software. That’s largely because they allow the developer to control how the software is presented when the image is opened. For example, if you’ve ever downloaded an app that displays an image directing you to copy the app binary to your Applications folder, complete with an alias of the Applications folder, that’s only possible with a disk image.  What to do when you see the message “The following disk images couldn’t be opened”The first step is to try re-downloading the disk image if you can. It may be that something happened during the download and corrupted the file. If re-downloading doesn’t work, and the disk image mounter on your Mac doesn’t work, you should use Disk Utility to verify the image.
How to deal with problems installing and running apps on your MacSometimes, when you can’t open a disk image, the problem isn’t with the disk image itself but with your Mac. Files that have accumulated on your boot drive can cause conflicts and prevent disk images from opening or applications from running correctly. CleanMyMac X’s Maintenance module can help resolve these issues. It can repair disk permissions, free up RAM, and run maintenance scripts. Here’s how it works.
Once you’ve run the maintenance routines, you should find that your Mac runs more quickly and smoothly. Disk images are virtual disks that are widely used to distribute software. They date back to pre-OS X times when the resource forks used by Mac applications could be easily transferred over networks. Wrapping software in a container that replicated physical media allow it to be transferred. They also allow developers to control how applications look when they are first opened after being downloaded. However, occasionally, they become corrupt or run into problems. If you find that a disk image is not opening, follow the steps above to fix it. You can also use CleanMyMac X’s Maintenance module to run regular maintenance on your Mac and keep it running smoothly. Anki stores your cards' sound and image files on your computer, in your , in User 1/collection.media. If you delete any files from that folder, Anki notes they have been removed and on the next sync it will remove them from your other devices as well. What sometimes happens is users tidy up files on their computer, and accidentally remove the sounds and images that their cards use, resulting in sounds not playing or images not appearing. This is particularly easy to do accidentally on a Mac with the "all my files" feature of the Finder, but can happen on other platforms as well. You can use Anki's Tools>Check Media function to find out which images are missing from your collection by looking at the "Used on cards but missing from media folder" section. If you've accidentally deleted the files your cards were using, you may be able to restore them from your recycle bin / trash can if the trash has not been emptied yet. Placing them back in the collection.media folder should cause the media to work again. If you are unable to recover your media from any of your devices, we may be able to restore it from AnkiWeb's backups for you if it was deleted recently. If you've lost your sound and images, but had obtained them from a shared deck, if the shared deck is still available you can import it into a new profile, and then copy the sounds and images from it into your original collection to restore the data. When editing fields, Anki shows the names of sound files. To see the names of image files, you can press ctrl+shift+x while the cursor is in the field with the image (cmd+shift+x on a Mac). For an image or sound file to work, a file with the exact same file name must be in the collection.media folder. |
