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I found an answer from the web on the head size.
VHS-C head drum
To reduce the size of cameras, the VHS-C mechanism uses a two-thirds size head drum (41.3 mm diameter instead of the original VHS drum size of 62 mm). The wrap angle is 270 degrees instead of VHS's 180 degrees. The drum rotates at a proportionately higher speed, and four rotary video heads are used to trace out exactly the same helical recording path as a standard sized VHS drum. By adding more heads, the same small VHS-C drum can record and playback FM Hi-Fi audio that is also fully compatible with a standard sized Hi-Fi video drum.
Smaller is better.
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“Once you eliminate the impossible...whatever remains, no matter how improbable, must be the truth." Sherlock Holmes.
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