Originally posted by drezon
I was speaking of a hypothetical possibility. I don’t know if there is a (SD protected) game that has audio tracks and, moreover, uses indices to access parts of these audio tracks.
But it is definitely possible that data CDs contain audio tracks (Mixed Mode style), and that these audio tracks contain indices, cd-text, ISRC and similar stuff encoded in the subchannel data.
Cossacks is a game with data and audio tracks. It is variously protected by ProtectCD (Australia, Asia, parts of Europe), SafeDisc 2 (US, parts of Europe) and Starforce (Russia).
I have the ProtectCD version which does require both subs to be read, due more to the prot than the ensconced audio tracks. Presumably, the SD2 version owners have had no trouble because I’ve only seen one (recently, too).
I think the issue is this, and again may I be smote if I’m wrong, that[ul][li]Audio CDs are Red BookData CDs are Yellow BookCD Extra is a two-session CD, 1st is CD-DA, 2nd is data (AKA “CD Plus”) but it’s got no colour book standardCD-ROM/XA eXtended Architecture, is a bridge between Yellow Book and CD-i
[/li][li]>>>>>>>>MODE-1 standard Yellow Book sectors>>>>>>>>MODE-2 may be of form-1 or form-2>>>>>>>>>>>>>>>>FORM-1 2048 bytes of data, with error correction, for data>>>>>>>>>>>>>>>>FORM-2 2324 bytes of data, no ecc, for audio/video[/ul]So what? Well, game discs can’t be CD Extra, because Windows only reads the last session - data, but no audio from the first session. Compact Disc players only read the first session - audio but no data (thankfully). Form 1 and Form 2 can’t coexist so the ‘audio’ tracks on a game CD are written as data.
Some newer PC drives can read CD Extra, I don’t have either a disc or such a drive so I can’t comment any further, it would be speculation and spath would rouse on me (again)
If CDs vary too far from a ‘Standard’ then they run the risk of not being a ‘CD’ and therefore unreadable by a MMC compliant player, like our PC CD-ROM.