@DOS76 I used PSX2PSPv1.4.2, which was game by game, 1 by 1. It took me forever... Well, like 4 days. I had the stat for how much space I saved, but I had to put my PC back a week with system restore and lost it. It was something like 400GB's across 700+ entries in LaunchBox?
@billyc999 PBP's were developed for PSP, which is why they uniquely work. They're just a container with an instruction set, but tailor made for PS1 games that just happen to be ran on a PSP. They run flawlessly with the Mednafen core for RetroArch and you have some actual benefit to using them. It's why I put my PSP and PS2 games in to CSO's as well, just minus the multi disc support. If you have a way to batch convert them then please share. I spent way to frikin long on mine. You probably couldn't batch convert multi disc games, because you need to specify disc 1, disc 2, etc, but that would save someone a ton of time if the compression and method are accurate. With the tools I used (PSX2PSPv1.4.2) you can also convert them back to their bin / cue or iso / cue format as well incase putting the game in the PBP breaks the game.