TigJackson
I got all the way through this, but at the 4th bullet under Step 6: Final Step - Build the new ISO, it indicates that after run IML2ISO.exe, and you see the dialogue boxes, that once you "hit start, it could take anywhere from 15 mins. to 30 mins. to create the image."
A file named gt4_hdd.iso (1,161,353 bytes) was created in the same directory in less than five seconds. Double clicking on this file launches Apache 2 again, and it appears to link to about 5 GB worth of files including the two huge VOL files. I realize that you need to use winhiip or something similar to transfer the image to the PS2 since the ultimate image will be more that can fit on one single layer DVD, but it still doesn't seem like I did this correctly.
Yeah well, that's something that needs a little work. You didn't use the directory "c:\test", did you? Neither did I, because I didn't have as much space on my C drive. The thing is that the tutorial and the files are set to only work when using "c:\test".
But you can work around this easily. Just before you do the step with IML2ISO.EXE, open the *.iml file that came with the patch with a simple text editor like the editor that comes with windows. The file contains paths to the files that will go into the final ISO image. You will find a lot of paths that say "c:\test\ ...". Now, what happens when you don't use that directory is that IML2ISO can't find those files and just leaves them out of the ISO image. You will notice this by IMS2ISO finishing the procedure within seconds presenting you an ISO file in the low MB range, just like yours.
Ok, so what you have to do is change the paths to link the the files on your harddisk. The editor that comes with windows has a function called "replace". Open it, and enter:
search for: c:\test
replace with: <your directory>
Then klick on "replace all", and there you go. All the paths should now be correct. You should check that they are, and that no backslash or anything was forgotten.
Example:
- the directory your files are at is e:\ps2games\gt4\granturismo4\*.*
- so, you must enter "e:\ps2games\gt4" into the "replace with" field
- after that, the paths in the *.iml file should say:"e:\ps2games\gt4\granturismo4\..."
Save the *.iml file, open IML2ISO again and have a go. Now, the process should take some minutes and output an ISO above 5GB.
Good luck!

the Interceptor