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I based my work on a tip that i found on the net, so I did some test on this game and i'm SURE about these points:
1) If you want to play the game You need AT LEAST:
default.xbe
disc1_0.dat
disc1_1.dat
disc1_2.dat
disc1_3.dat
disc1_4.dat
disc1_5.dat
disc1_6.dat
disc2_0.dat
disc2_1.dat
disc2_2.dat
disc2_3.dat
disc2_4.dat
disc2_5.dat
disc2_6.dat
these files allow you (skipping after Konami logo with Start button) to start the game and go on the tanker (test and saved). As you can notice the files size is over 4.37Gb (with 1024bytes = 1kb), so YOU CANNOT BURN THIS ON 1DVD!!
2) If you have a save on the tanker (just after the Otacon's call) you can remove disc1_6 and you can FIT A DVD, BUT you need a to LOAD the previously saved game and you'll lose the intro. So you can burn:
default.xbe
disc1_0.dat
disc1_1.dat
disc1_2.dat
disc1_3.dat
disc1_4.dat
disc1_5.dat
disc1_6.dat <----Keep this and remove disc2_6.dat sorry i made a mistake!!
disc2_0.dat
disc2_1.dat
disc2_2.dat
disc2_3.dat
disc2_4.dat
disc2_5.dat
+ a save file to be copied on HDD
Again skip after Konami logo with Start button.
3) Snake tales ONLY are available if you build a DVD with:
default.xbe
disc1_0.dat
disc1_1.dat
disc1_2.dat
disc1_3.dat
disc1_4.dat
disc1_5.dat
disc1_6.dat
disc1_7.dat
disc1_8.dat
disc2_0.dat
Again skip after Konami logo with Start button.
NO Special NO game (let me call it "story mode") ONLY snake tales.
4) i'm pretty sure that, as another person posted on the net, the following files are for:
disc1_7 end credits
disc1_8 VR missions+snake tales
disc2_7 Special
disc2_8 1st Video
5) Konami put a sort of PROTECTION on the game, I think they build the game around 2 STACK FILES (call them disc1.dat and disc2.dat). For technical matters Xbox cannot handle big stack files (over 3Gb) so they probably split them in 8 parts.
You need to look at every files as A PART OF ONE BIG STACK FILE and not as single-stand alone files...
I mean that there is a sort of continuity between files: eg. You cannot rip file 6 and leave 7 and 8 because to reach file 7 the game will "read" file 6.
As I mentioned before if you think about the big file and the game wants VR mission it doesn't call "read file disc1_8.dat", but probably "find the file x at the offset y", where offset means "at 3 gb from here (disc1_0.dat)" for example.
In fact a way to read a resource file (a file with other files packed inside) is to start the reading process from an "offset" (a distance from the begin measured in bytes) and continue for a certain lenght (the lenght of the data i want to read). So to read something on the last file of a disc set the game expects to find all the others(as parts of one big splitted file), if not BLACK SCREEN.
It is the reason for I am not able to start the first video (after konami logo): because to see that video i need all disc 2 files (and my little hdd is out of space for that)
To complicate the things some other feature (like VR) MAYBE needs also a lot of files (disc2_X.dat) to work.
In fact files discX_0.dat are composed for 99% by zeros so their function is to shift ....if you cut the file you break the corret offset and the game doesn't work.
6) The only solution is a repack of the games in which files full of zeros will be cut (about 600MB recovered only inside disc1_0.dat and disc2_0.dat files) and the resource reindexed according to the cut done.
Actually i think it is IMPOSSIBLE to preserve the whole gameeven with a 2/3 DVD rip...
Point 5 and 6 are my speculations but the behaviour of the game seem to confirm that.
Sorry for my bad english and the lenght of the post.
Feel free to reply because i would like to have some feedback from other users.
Thanks for your patience.
** PS FOR THOSE WHO AREN'T ABLE TO BOOT THE GAME CHECK THE INTEGRITY OF YOUR FILE WITH THE CRC CHECK ON THEM
; Generated by WIN-SFV32 v1.0
; (Compatible: Windows Commander 5.10)
disc1_0.dat EDC0AE07
disc1_1.dat 4EEEBC2E
disc1_2.dat 808D8A5D
disc1_3.dat 1C9AF146
disc1_4.dat 09BA6190
disc1_5.dat 8A00C7F1
disc1_6.dat 40547E06
disc1_7.dat 7A3EA7DF
disc1_8.dat AE0CB6D1
disc2_0.dat 3D38754E
disc2_1.dat E8F9603D
disc2_2.dat 53B21C2F
disc2_3.dat 35A344F6
disc2_4.dat 3586803C
disc2_5.dat A614C03E
disc2_6.dat 2E92323C
disc2_7.dat D771CA02
disc2_8.dat E20AF600
default.xbe 4A399743
Those are my files...don't consider them as "correct" take them only as reference to compare with yours
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Mgs2 -my Tests + Results-, Another point of view
Nov 17 2002, 04:52 PM
those are some good observations, but i have been able to boot the game with just the files i specified. ill make a little video in a few minutes. hopefully people wont think i'm lying then, lol. good hacking though! much appreciated. we need a reindexer if stack files means what i think, and sorry, but i'm not that good at programming yet. or file extracting 
What am I dong wrong. I've put :-