This specification anomaly sounds like the polycarbonate equivalent of vinyl's multiple-groove capability. [0]
I'd first heard of this for a Monty Python record (wikipedia notes this is in fact the most famous use case) but checked to see if people went for >2 grooves, and seemingly they did. I expect the casting for the pressing was horrendously expensive, which is why it didn't happen an awful lot.
I suppose both mediums shared the less-well-hidden feature where a long silence separated the penultimate from the ultimate track.
I'd first heard of this for a Monty Python record (wikipedia notes this is in fact the most famous use case) but checked to see if people went for >2 grooves, and seemingly they did. I expect the casting for the pressing was horrendously expensive, which is why it didn't happen an awful lot.
I suppose both mediums shared the less-well-hidden feature where a long silence separated the penultimate from the ultimate track.
[0] https://en.wikipedia.org/wiki/Multisided_record