What's the rule for "disc" vs. "disk"? Paging @propensive.
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Yes. And American OSs set the trend for the kind of disc associated with a computer, at a time when people were learning what they were. So we now always use "disk" for computer discs. My last British computer still said "disc" to me in about 1999.
I would be tempted to say that if it's visibly circular and flat, you would write "disc", for example, "I took the lid off my hard disk, and could see the disc spinning inside!"
