I had an unmountable floppy image (.img) that contained an operating system I had made and I used disk utility to burn it to a CD. It said that the burn was successful.
I tried to boot it from VirtualBox, which had worked with the image, but it wasn't successful. I tried to erase the disk but Disk Utility wouldn't let me. It also wouldn't let me burn a different image to the disk or use first aid. How can I erase the disk so it is usable again?
I am using a MacBook.