GCN Why can't you just copy a GC Disk 1:1 ? How does the GC prevent that?

Cyan

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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 image are not really 1:1 or they couldn't be understood by the burner program if they were burned right away. 1:1 dump are raw (the first Wii disc were raw and couldn't be burned as ISO).
"1:1" as people know it are in fact restructured to be standard ISO9660.
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 interested about the layout structure, 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 program did the same thing and was more known and still used nowadays (Wiiscrubber).
 
Last edited by Cyan,

Der_Blockbuster

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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

Alright thank you, it seems like theres much more behind it then I thought. :unsure:
Allthough a DVD Drive with the right firmware could be an Idea, but thats just me guessing. If it was that easy, there would be tools ect. already. ;)
 
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