Thanks for the useful information.
Maybe this is already known, but I noticed something while looking at several PS3 save files. If you open an SFO file from a save game and look after the word "TITLE" (for reference only) you'll see 16 bytes. This seems to be console specific and is always the same no matter which game.
Also, at the end of the PFD files, that 20 byte sequence which appears to repeat, well that isn't always the case. After looking at several files, it seems the 20 byte sequence usually repeats, but sometimes one of the sequences is different. Try adjusting your display so you can see it in neatly aligned columns and you'll see what I mean.