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Comment drum memory ! (Score 1) 1127

The navigation system on early missile boats had no hard drive. The used a rotating drum. The drum was slightly conical so that an adjustment screw could raise it up/down slightly to change the distance between the drum an the surrounding read heads. If you went to far (we did) the drum would wipe out against the read heads. Then you spent a day disposing of a drum with secret data on it. Fun days !

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