[QUOTE=durkinjt;2642608]Dumb question, what does the virtual drive do?[/QUOTE]
It allows you to mount ISOs which are single file archived disc images (usually CD, DVD or Blu-ray) and as the ISO includes the file system, it’s like accessing the files as if you were reading the original disc.
So some people find this a convenient way of storing lots of disc images on their hard drives.
They don’t necessarily have to be video related as you can create an ISO from any sort of files but using them to store Blu-ray and DVD movies discs is common as well.