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Image not recognized mac dmg3/7/2023 ![]() Note that this doesn’t apply to read/write disk images, as they don’t store checksums.Ĭalculating the checksum takes a while, so before doing that, macOS looks to see if it has already been done. When you open and mount it, macOS checks that checksum. If the disk image is read-only (as are most installers and apps supplied on disk images) or compressed, when it’s saved it includes a checksum of its entire contents. Before it will offer you the contents of that virtual volume, macOS puts it through some basic checks. To know how to resolve this, you need to understand what happens when your Mac tries to mount that disk image.Ī disk image is just a file that macOS opens and mounts as if the data contained within it were stored on a disk volume. Worse still, the image hasn’t been mounted, and repeating the action doesn’t help. Let’s say you wanted some files which are stored in an old disk image, so you double-click the image to mount it, and see an error message. ![]() Disk images are normally both robust and reliable, but every once in a while they can cause problems.
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