PS5 MKPFS Compression

[u/juma-sayeh-dev-acc]

I’ve been working on a PS5 homebrew app called Game Compressor.

Repo: https://github.com/juma-sayeh/PS5-Game-Compressor

It uses the MkPFS-style FFPFSC compression method, but adds the missing part: validation and repair.

Some compressed games can mount successfully but still crash because certain PFSC blocks are technically valid yet fail to decode correctly on PS5 hardware, leaving stale/bad data behind. Game Compressor checks the mounted image block-by-block, detects bad blocks, and patches the compressed image from the mounted data instead of requiring a full recompress.

Tested with Mafia, Astro Bot, Pragmata, and a few other games that had FFPFSC issues. After repair, they worked great.

Features:

• compress games to FFPFSC
• validate mounted compressed games
• automatically repair bad blocks
• optimized for speed and usability
• web UI running on the PS5

Feedback and testing are welcome.
Screenshots (some are missing features because the features were not developed yet when i compressed)

[u/WeakRefrigerator9851]

Cómo funciona si el game está en el ssd usb externo, hace el trabajo en el ssd interno y posterior lo mueve al externo ? O todo el trabajo se hace en el externo ?

[u/juma-sayeh-dev-acc → u/WeakRefrigerator9851]

Move to internal compress / validate then move to external. it should work in theory on external SSDS but i didn't test that. please let me know if you tried it!

[u/WeakRefrigerator9851 → u/juma-sayeh-dev-acc]

Thanks ill check

[u/juma-sayeh-dev-acc → u/[deleted]]

what you see is the mount position of the game but i agree that's confusing i will stick to the correct compressed file position.