this post was submitted on 02 Apr 2025
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I always thought UHD used a different laser than standard blu-ray, but only just found out it was a trick of h265 encoding and triple layer discs.
Based on the mini-BD format, assuming triple layer, the upper limit would have been around 24GB.
Oh, I missed the UHD bit, right. Triple layer it'd cap at 20-25, yeah. Technically Switch carts were available up to 32GB, but I think like one or two games ever used that much, they were so expensive. That's where the partial download stuff comes in.
Of course for optical media the solution was always to ship multiple discs, because the smaller discs are so cheap. Or were. With most optical media manufacturing phased out who knows how expensive optical will become.