If you want to optimize your handheld setup further, let me know:

: CHD is a "lossless" compression format originally created for MAME to store large amounts of data (hard disks, CDs, etc.) efficiently. PPSSPP Compatibility : Modern versions of the PPSSPP emulator

Compared to the previously standard CSO (Compressed ISO) format for PSP, CHD offers a . The specific file compression algorithms used by chdman (the creator tool) often result in significantly smaller file sizes without any loss of data or quality. For a library of hundreds of games, this can save dozens, or even hundreds, of gigabytes of storage space on devices like the Steam Deck, phone, or Raspberry Pi.

The Ultimate Guide to PSP CHD Files on the Internet Archive: Achieving Extra Quality Playback

To convert all ISOs in a folder at once, use this simple loop:

The term "Redump" signifies that the original ISOs were verified against a global database to ensure they are 100% accurate, clean copies of the retail discs. Buying into a "Redump CHD" archive ensures you aren't getting broken, modded, or corrupted game files.

If you are building a retro handheld or setting up software on your PC, you will be glad to know that support for CHD is almost universal for modern emulators of disc-based systems.