Not all devices use "spinning disks"
Any more, not even most. Yes, I do agree that laptop and desktop computers do, but there's not one modern tablet that does; most "ultrabooks" don't; cameras don't; MP3 players don't; printers don't... well, you get the message. As I comment farther down, I ran into the limitations years ago while editing videos for my clients where USB simply wasn't fast enough or accurate enough. I'll grant USB is faster today, but it's also trying to run NASCAR on a two-lane highway.
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