Join Date: Sep 2010
Location: Puerto Rico, U.S.
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Hiyas guys, I posted some research technical information here that you might find useful
I'll quote myself just in case xD...
Size difference between old ISOs and new ISOs
From my experience coding my personal (unreleased) disc reading library for Windows, from what I understand, I will assume that the size difference its because the ISO is not really created following the ISO9660/MODE1/2048 (+UDF/Joliet/...) standard, but probably created as ISO9660/MODE1/2352 (+UDF/Joliet/...) or BIN (binary). So each sector will have 'synchronization data', and 'Error Check Data', found on Discs to allow recovery / re-creation of sector data in case of Disc Surface damages and such.
Such 'extra' data located on ISO/MODE1/2352 BIN (binary) disc images is not so evident on regular old school CD (700mb) images, size of the ISO/MODE1/2048 version of it will always be less.
I bet they didn't even include a .CUE file as well, since they are "probably" not following any standard.
Anyway, ISO9660 disc images in binary form should always be named .BIN and include a .CUE file.
There is a probability that I am wrong, maybe it is some kind of new ISO that doesn't follow any Standards (I really doubt it xD), but I will try to acquire the released "ISO" to verify it myself.
I hope that if my theory is right, these release groups choose to release future disc images as BIN/CUE, just to avoid any confusion with already circulating ISOs.
Reason to Release new "ISO"s
I doubt that the reason of releasing such "ISO"s is because Sony could detect regular ISO/MODE1/2048 (LOL ). The Cobra Optic Drive Emulator, was probably designed to read data as the real BD-Drive reads it, so when it cannot find the original 'synchronization data', 'header', 'error check data', etc...it will most probably give read error.
EDIT: Just to confirm my point, I made a custom disc image following ISO9660/MODE1/2352 standard of "BCES01435-[PlayStation All-Stars Battle Royale]", and the resulting size is 6.75 GB, very similar indeed to the one released by "TL" group. If I made the custom disc image as ISO9660/MODE1/2048 then the resulting size would be approx. 5.84 GB.
I just need to acquire one piece of the release made by "TL" and I will be able to confirm if the ISO is a BIN named and published incorrectly without proper CUE.
Edited my original post:
EDIT2: The difference between their size is approx. 13.48% [ ((6.75 - 5.84) / 6.75) * 100 ]. So if this difference rate is same in all PS3 disc images ripped as ISO/MODE1/2352, then a 40 GB game would have approx. 5.39 GB more when saved as BIN/CUE.
Last edited by CaptainCPS-X; 01-20-2013 at 03:43 AM.