Originally Posted by YlodedKing
Why not just use .iso ? one file and its simpler.
Also give details which manager you using .
On Iris Manager you put the ps1 games on the PSXGAMES folder and each ISO has its own folder for example : dev_usb000/PSXGAMES/KULAWORLD/KULAWORLD.ISO .
You could do the same also on internal PS3 HDD you just create the same folder on root 
For Multiple discs :
/dev_usb000/PSXGAMES/CHRONOCROSS/CHRONOCROSS_disc1.ISO
/dev_usb000/PSXGAMES/CHRONOCROSS/CHRONOCROSS_disc2.ISO
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For multiple disc, do multiMAN acknowledge the same name format or as long you clarify and distinguish the names for PSX ISOs in the correct sequential pattern.
For example:
/dev_usb000/PSXISO/LEGENDOFDRAGOON(DISC1).ISO.
(Also using correct spacing in name title)
-Same name and directory classify it as Disc 2
-Same name and directory classify it as Disc 3
-Same name and directory classify it as Disc 4
Or is that the best and correct way like you did the Chrono Cross setup so that it can determined as multiple disc?