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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: https://www.youtube.com/watch?v=fT4lDU-QLUY
Image credits!
VERA --http://www.vtoldboys.com/images/vera3.jpg
Kinescope --https://tcf.ua.edu/Classes/Jbutler/T311/KinescopeArticle.jpg
Kinescope 2 --http://provideocoalition-moviola.netdna-ssl.com/app/uploads/KinescopeMachine2-cc.jpg
Telecine, Rotary Transformer, Slip Ring Pickup—Wikimedia Commons
Quadruplex: --http://www.quadvideotapegroup.com/images/CBS-TVC-Engineer-John_Radis-At-VTR.jpg
Quadruplex 2 --https://storage.googleapis.com/afs-prod/media/media:a95d90cdd44148288e103fd73d83f72c/800.jpeg
Quadruplex Heads --http://arstechnica.com/gadgets/2013/06/the-future-of-tv-a-star-is-born/2/