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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.
Many .img files are simply ISO images with a .img extension. And if a CD/DVD burner recognizes the file format, there's no reason why it can't be successfully burned to an optical disk. There's nothing magical about floppies or optical storage that prevents data from being transferred from one to the other. His problem was likely due to an error during the burning process or faulty media. – Lèse majesté – 2012-03-11T21:58:42.420