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These are things there aren't strictly right/wrong answers to - they vary over time or location - we just judge them against current conventions. Optical storage is not the only type of digital storage - you're completely missing out all the magnetic and semiconductor media. For me, disk is a general term of storage media (hard disk, vinyl disk, USB disk, please insert a disk), whilst disc is a name used in the names of optical media (CD/DVD). A Disc is a type of disk. For DVD, versatile has always been its real name, never video. It was a compromise between the SD and MMCD formats, always designed to have different formats and types (just like CD). Saying "Digital Video Disc" is just wrong. I often wonder what a PC would be like to use for someone who had never used it before, and didn't know our conventions and the things we take for granted. Would they have any clue what Excel and PowerPoint were for? Would they figure out the start menu? Would they prefer Windows or Mac? Could they use a mouse? Would they figure out keyboard shortcuts? Could they find their way around the internet without knowing where to start or what a search engine did? If anyone has a spare English-speaking feral person who's never interacted with a computer, send them to TGTAP HQ so we can test this theory.