I have an auxillary optical drive. It has been plugged in for a long time, but I almost never use it. I just noticed it has a DVD in it. Apparently, I downloaded an ISO of Linux Mint 19.1 with plans of learning the OS.
But just what 'type' of file is on the DVD? It doesn't seem to be usable in its present state. How can I render it usable, or should I just download another ISO? Properties says this is a CDFS File system.