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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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DVHS demo video from Techmoan:    • New York City in 1993 in HD   DTheat...  

Image credits!
VERA http://www.vtoldboys.com/images/vera3...
Kinescope https://tcf.ua.edu/Classes/Jbutler/T3...
Kinescope 2 http://provideocoalitionmoviola.netd...
Telecine, Rotary Transformer, Slip Ring Pickup—Wikimedia Commons
Quadruplex: http://www.quadvideotapegroup.com/ima...
Quadruplex 2 https://storage.googleapis.com/afspr...
Quadruplex Heads http://arstechnica.com/gadgets/2013/0...