It’s easy to check this using hdiutil in a command of the form If you have worked with hdiutil in the past, you may now be wondering whether this fault in Disk Utility is because the disk image has strict resize limits. The only solution must then be in the hdiutil command tool, despite its earlier warning that “hdiutil resize cannot resize filesystems other than HFS+ and its variants.” Thankfully, klanomath has worked out a solution here which is quite elaborate but appears to work on High Sierra and Mojave, with both regular and sparse disk images. It’s worth pointing out that if you repeated this but made the format of the disk image HFS+, resizing works absolutely fine. You can try changing the size of its container by repartitioning the image, but as the total size of containers can’t exceed the size of the disk image, that also gets you nowhere. You can try mounting the image and then resizing it: all that does is change the text in the error message. There’s no workaround in the Disk Utility app. You won’t even get as far as being invited to enter a new size, as Disk Utility comes straight back with an error. Now, follow Apple’s instructions for resizing that disk image using the Resize… command in the Images menu. To stop that, simply select your internal disk at the left, and it should behave more normally again.
This is likely to provoke another lesser bug in Disk Utility: it will now start showing bursts of the spinning beachball and be sluggish in response. Once it’s created, eject your new disk image. You can make its image format anything you like, including a standard read/write disk image or either of the sparse options. Use Disk Utility’s File/New/Blank Image… menu command to create a new disk image, setting its format to APFS, and its size to something reasonable like 100 MB. And I believe that this has been the case since the first full release of APFS in macOS High Sierra eighteen months ago.
But if you create a disk image in APFS format, Disk Utility has a problem: it can’t change its size. Most users prefer to create and maintain them in Disk Utility, as the command tool hdiutil which handles them is so complex. Disk Images are a popular way to deliver software and a great deal more.
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