Disk Image Can't delete
iMac (Retina 5K, 27-inch, Late 2014), OS X Yosemite (10.10.5)
Hi Neal2s,
Thanks for using the Apple Support Communities! I'm sorry to hear that you are having these issues with your Mac. I also apologize, I'm a bit unclear on the exact nature and scope of your issue. While disk images, when mounted, appear as drives or volumes in Disk Utility, when unmounted they should appear as a normal file within the Finder (usually with a .dmg file extension). After unmounting/ejecting the Disk Image, you should be able to delete it like any other file, as outlined below:
OS X El Capitan: Delete files and folders
Regards
Disk Image Can't delete