A reminder that CD-ROMs are pressed from glass masters, not burned like CD-Rs. I wonder if anyone has tried something like this with burned discs, though.

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kevin_thibedeau 7 hours ago | parent | next [-]

The multisession standard actually afforded the possibility of CD-PROM; a hybrid disc with a pressed read-only session followed by a writable section. It was only used for Kodak Picture CD (not the same as Photo CD) to hold software in the pressed session. It also apparently standardized a magneto-optical hybrid that never made it to market.

	▲	kalleboo 6 hours ago \| parent \| next [-]
		It was also used by Ricoh EncryptEase - CD-Rs with encrypted backup software in an initial pressed track. https://www.youtube.com/watch?v=_5ucImqdKbY
	▲	notpushkin 3 hours ago \| parent \| prev [-]
		Hmm, it could work then if they’ve pressed most of the game data first and then recorded the encrypted part for each disk. But I guess the tooling for such setup would still be too expensive.

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ekelsen 8 hours ago | parent | prev [-]

Yes, my point, if the answer is that there is no way this works without every disc being different.

It was not possible to manufacture at the time at scale.

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fluoridation 7 hours ago | parent [-]

It's still not possible. You would need to make a unique master for every individual unit.

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vanviegen an hour ago | parent [-]

You'd use CD-R of course.

	▲	fluoridation 38 minutes ago \| parent [-]
		With CD-Rs it was already possible in the mid '90s, if we're talking mass production. CD-Rs are a little more expensive to produce, but not much more so. A slight concern is that readers of the time might not have been able to read the discs, because CD-Rs are not quite as reflective as CD-ROMs.