I think is going to be handy to have a
PS3_DISC.SFB editor too
One of the first things the PS3 does when reading a bluray is to look at the "hybrid flags" that appears on that file
The hybrid flags tells to the PS3 the kind of content/s included in the disc
If the flag exist... the PS3 searchs for an specific type of content at a predefined path of the bluray
If doesnt exist... the PS3 doesnt even searches at the predefined path (even if the files exists, are ignored)
By editing the PS3_DISC.SFO you can achieve 2 goals:
To remove content
This is sotmehing i mentioned to you before in private, the ISO tools that have an option to remove the PS3UPDAT.PUP file (and folder) from the bluray doesnt changes the hybrid flags of PS3_DISC.SFB (or as far i could see none of the tools does it) but is an error... is better to remove the hybrid flag "u" because this is how is made officially
The bluray games without PS3UPDAT.PUP doesnt have the "u" in PS3_DISC.SFB
Additionally, there is people like me who uses to play with the backup inside internall hdd of the PS3, so at the time of building the ISO we remove some "extra" stuff not needed, like videos or themes from PS3_CONTENT path
The paths are predefined, so you can identify all contents and add/remove the "hibryd flags" for them at the same time you delete/add files to the bluray game
To add content
Themes at dev_bdvd/PS3_CONTENT/THEMEDIR/PARAM.SFO
Videos at dev_bdvd/PS3_CONTENT/VIDEODIR/PARAM.SFO
*Edit:
Also, if you are going to add a conversor PKG--->to--->ISO i guess is going to be needed to create the PS3_DISC.SFB files from scratch
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Additionally, is posible to create "multiboot" bluray discs (with several main EBOOT.BIN displayed by XMB at the same level) using paths PS3_GM01, PS3_GM02, etc...
But to make this is needed a LIC.DAT editor (because this file has an entry for every main EBOOT.BIN in the disc)
Also, the other way around... you can "split" the bluray games that originally was "multiboot"... this is a minory though, the number of offical "multiboot" games can be counted with the fingers of a hand