Hello !
I happen to have this UMD disk, and there actually IS differences from the retail release. Here is a picture of the UMD itself :
I got that on Ebay for a much cheaper price than what's listed above, and even got the Duodecim one on PSP of Dissidia
Well, since the ID of the game is different, I had to rename the save file folder of the PSP game to match it with this release. And my save indeed worked very well.
As for the file size in comparison of the retail version, there IS a difference. Someone told me it can differ with certain prints of the same game, depending of how it was manufactured, but it cannot justify such size differences. I even have the promo version distributed to the press with the little square shaped paper and the UMD inside, and it totally matches the UMD size of the retail version.
Here, take a look :
ULES01270 (Retail Version) : 1611 Mbs
ULET01271 (Pre-Production) : 1637 Mbs
It is as shown on my PSP while dumping the disks to compare them if there is any differences. Here it is :
But what is the actual differences then with the retail version ? I cannot precisely tell, but all I found while comparing both disks is that there is a dummy file of a cutscene left on the disk.
It's an .
xml file that have been modified the
3rd of October 2008, a date that happens to be even
before the japanese release, the 18th of December 2008.
The left one being the retail version, while the right one is being the pre-production.
Another detail difference is in the "
DATA" folder with the files "
PACKAGE_INFO.bin" and "
PACKAGE.bin" that have a totally different file size. Look at that by yourself, and also, they have a different modification date as well.
But what does files contains ? I have no ideas, we would need someone that is good enough to do a data mining here, because it's not something I know how to do.
That's what I could contribute to the case, I hope it was helpful to anyone. And if Shademp wants the ISO file to do some researches, please contact me by sending me a PM ! ^^
PS : The source of the UMD disk pictures are from my Instagram account. No pictures were stolen ! ^^
https://www.instagram.com/p/BVNYdZ6Dnew/?taken-by=tenshin26100_gaming