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Both are helical scan right? I would think that would make reversal impossible.

Indeed, they're all helical scan systems. With V2000, though, it worked somewhat like audio cassettes, with only half the width of the tape used per side, being flipped over to use the other half.

https://en.wikipedia.org/wiki/Video_2000

Fun fact: Video 2000 wasn't Philips' first video format, with the now-confusingly titled Video Cassette Recording format predating it. The format is notable for having both tape spools coaxial, so the head is parallel to the base of the recorder, and the head angle is instead provided by the angle of the tape traveling between the upper and lower spools.

https://en.wikipedia.org/wiki/Video_Cassette_Recording

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