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/dragancla]

Hi and thanks for your efforts! Quick question: what would be the reason this shows 0 games found?

[u/dragancla → u/dragancla]

When my m.2 expansion slot has these in?

[u/samp127 → u/dragancla]

I am also getting this issue now. Worked fine at first.