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afterdawn.com > forums > consoles > ps2 - dvd backup discussion > another idea for gt4 (dvd9) backup (shady08)
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Another Idea for GT4 (DVD9) Backup (shady08)
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ju_
Newbie
_ 		18. March 2005 @ 07:34 _ Link to this message    Send private message to this user   
This is the first time in over 10 years of web access I have posted a comment so please be gentle.

This is realy a continuation from thread
http://forums.afterdawn.com/thread_view.cfm/41/142061
which was stopped 9th March and really an idea based on the last postings of shady08.

As far as I can can tell from the thread the idea was that the DVD 9 GT4 layer 0 (1) is built from the inside out and layer 1 (2) is build also from the inside out.

But most(?) DVD-DL write layer 0 (1) from the inside out and layer 1 (2) from the outside in.

The thread said that it was easy to extract layer 0 (1) and layer 1 (2) as two separate ISO's. Shady08 also stated that his DVD-DL software (nero?) could burn the two separte layers with a user defined offset.

So if the ISO were burnt back to the DVD9 disc as separate layers layer 0 (1) would be OK but layer 1 (2) would start at the outside of the disc not the inside of the disc, and if I am not mistaken this would not make the backup work as the code would be trying to read wrong or no data at all.

OK here is the idea :-

Create two separate ISO one for layer 0 (1) and one for layer 1 (2). Find or write a program which will reverse the layer 1 (2) ISO completely. Don't ask me how a ISO is constructed I do not know, so a straight reverse might not work. Burn layer 0 (1) back to the disc as normal but burn the layer 1 (2) [reversed ISO] back to layer 1 (2) using the user defined offset to set the last part of the [reversed ISO] at the starting point of the inside part of layer 1 (2) and the first part of the [reversed ISO] at the outer part of layer 1 (2).

Thus in effect writing the ISO backwards making the disc layer 1 (2) read from the inside to the outside even though the disc has actually been burn from the outside in.

Little Diagram to help

Layer 1 (2) Layer 1 (2)
Inside Outside
|| | ||
||| | || ||| | ||
||| | ||
||| | ||
||| | ||
||| | ||
| |<--------->
End of Start of |
reverse ISO reverse ISO User
Defined
Offset
<<<<<<<<<<<<<<<<<<<<DISC BURN THIS WAY<<<<<<<<<<<



I really hope people understand this idea because it is very hard to put into words (see diagram). Like I said first post in 10 years be gentle....
[ + quote]
ju_
Newbie
_ 		18. March 2005 @ 07:44 _ Link to this message    Send private message to this user   
Better(?)Little Diagram to help

Layer 1 (2)............................Layer 1 (2)
Inside.................................Outside
|||.......................|...............||
|||.......................|...............||
|||.......................|...............||
|||.......................|...............||
|||.......................|...............||
|||.......................|...............||
|.........................|<------------->
End of...........Start of.|...........\/
reverse ISO..... reverse ISO..........User
......................................Defined
......................................Offset

<<<<<<<<<<<<<<<<<<<<DISC BURN THIS WAY<<<<<<<<<<<
[ + quote]
squizzle
AfterDawn Addict
_ 		18. March 2005 @ 17:14 _ Link to this message    Send private message to this user   
Quote:
Find or write a program which will reverse the layer 1 (2) ISO completely.
This would be so difficult. I looked at the ISO in WinHex and it is almost 9 MILLION PAGES of code. Better off buying the game.
[ + quote]
Convert PAL to NTSC or NTSC to PAL------>http://forums.afterdawn.com/thread_view.cfm/167922
ScubaPete's guides------>http://www.dvdplusvideo.com/tutorial007.html
Bbmayo's guides------>http://home.comcast.net/~bbmayo/index.html

My ever-growing movie collection------>http://www.intervocative.com/dvdcollection.aspx/squizzle
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Nephilim
Moderator
_ 		18. March 2005 @ 18:23 _ Link to this message    Send private message to this user   
[ + quote]


My killer sig came courtesy of bb "El Jefe" mayo.
The Forum Rules You Agreed To! http://forums.afterdawn.com/thread_view.cfm/2487
"And there we saw the giants, and we were in our own sight as grasshoppers, and so we were in their sight" - Numbers 13:33
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afterdawn.com > forums > consoles > ps2 - dvd backup discussion > another idea for gt4 (dvd9) backup (shady08)
 

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