Hello, I've heard that the GC Disk are burned backwards, but I don't think that this makes Copying the games impossible.
How does the GC know that?
How does the GC know that?
DVD-ROM:
4bytes 2bytes 6bytes 2048bytes 4bytes
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
| ID | IED | CPR_MAI | User Data Frame | EDC |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
^ | 2048bytes cipher stream |
^ - - - - - - - - - - - - - -
scrambling
seed index
Gamecube/WII Optical Disc:
4bytes 2bytes 2048bytes 6bytes 4bytes
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
| ID | IED | User Data Frame | unknown | EDC |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
| 2048bytes cipher stream |
- - - - - - - - - - - - - -
That's a myth, the disc is not spinning backward, nor is written in reversed order (side to center).
a very good website (unfortunately not online anymore) explained how the data was written on the disc.
hopefully, you can still read it thanks to web archive
http://web.archive.org/web/20080619172414/http://www.ingenieria-inversa.cl:80/?p=9
having a non standard layout, only one computer DVD drive model could read it without rejecting the disc.
the author (xt5) released a program which applied that structure information to unscramble (re-position/shift) the data in order to allow standard disc reader/writer to understand the data. if you have a burned disc, it has already been "shifted".
real 1:1 disc are not really 1:1 if they can be burned right away. 1:1 dump are raw (the first Wii disc were raw and couldn't be burned as ISO).
I'm not sure about GC disc format, but the site is explaining GOD/WOD format as if it was the same.
edit:
the web archive is not properly formating the text, for users who are really interesting about the technical layout, here is the correct one :
DVD-ROM:
4bytes 2bytes 6bytes 2048bytes 4bytes
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
| ID | IED | CPR_MAI | User Data Frame | EDC |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
^ | 2048bytes cipher stream |
^ - - - - - - - - - - - - - -
scrambling
seed index
Gamecube/WII Optical Disc:
4bytes 2bytes 2048bytes 6bytes 4bytes
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
| ID | IED | User Data Frame | unknown | EDC |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
| 2048bytes cipher stream |
- - - - - - - - - - - - - -
that website was also later responsible for TruchaSigner (program to decrypt/extract/inject/resign Wii discs, back in 2008) and another