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goodcowfilms.com: farm: sega: random archives: dreamcast - how a gd-rom works

 

A Dreamcast disc is broken up into multiple partitions. There's a PC
partition, a CDDA partition, and then the high density GD partition, which
can also contain CDDA, but only readable by the Dreamcast.

1st session - 35 meg PC partition
- This is the section a PC can read. These 35 megs often have either extra
"goodies" (Omake folders) or copyright text files. This is what your PC is
reading. Notice how the disc is only "a few megs?" It really isn't, your PC
just can't read the 3rd session. (see below)
2nd session - CDDA
- Audio warning track. "Do not play this disc in a CD player... damage your
speakers, etc."
3rd session - 1 gig GD high density area
- This is the area that can only be read by a Dreamcast laser. 1 gig for
game data. CDDA can also be stored here (audio *tracks* such as Quake 3
uses) but the CDDA here cannot be read by a normal CD player. (any developer
worth his salt would use ADX files [a streaming codec] for music though and
save the rest of the disc space for more game data though)

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