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These days a VCR seems more quaint than anything else. But in fact, there's a device inside every VCR that solved what seemed to be an unsolvable problem. The video head drum is a fascinating solution to the complex problem of tape speed, and therefore I think it deserves to be remembered. Plus, the video head drum shares some motor technologies with modern hard disk drives. So there's that.

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D-VHS demo video from Techmoan:

Image credits!
VERA --
Kinescope --
Kinescope 2 --
Telecine, Rotary Transformer, Slip Ring Pickup—Wikimedia Commons
Quadruplex: --
Quadruplex 2 --
Quadruplex Heads --

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