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mdhughes@lemmy.sdf.org ⁨4⁩ ⁨weeks⁩ ago

Other way around. You punched the edge to make it writeable (or double-punched to write on the back side, if you were brave). Cover it to make it read-only. The 3.5" sliders were the same mechanism, open was write, closed was read-only.

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