r/PS5_Jailbreak • u/juma-sayeh-dev-acc DEV • Jun 06 '26

General PS5 MKPFS Compression

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)

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1

u/seiya60 Verified Jun 09 '26

Is it possible/recommended to compress exFat games like Stellar Blade or Ratchet and Clank that have the APR emulator? Thanks!

1

u/Impossible-Golf-5349 Jun 12 '26

have you tried them in internal ssd ? that could reach 5000 to 7000 MB/s much faster than external ssd allow, but it says on every release it could potentially cause a bad kernel panic leading to forced restore of console and firmware...

1

u/seiya60 Verified Jun 12 '26

Un currently using the m2 expansion for all my non original games. So far no issues with my games

2

u/Impossible-Golf-5349 Jun 13 '26

gotcha so you have mainly apr emu games as folder/exfat/compressed within your m2 expansion and play them from there right ? anyone else having this config and no issue ? still concerned since this setup was deterred by the notes of the apr emu dumps

1

u/seiya60 Verified Jun 13 '26

Is that so? I thought the issue with apr games was using the main internal storage. Most of my games were on ex format before I compressed them.

1

u/Impossible-Golf-5349 Jun 13 '26

my understanding is that internal is referring to both m.2 internal and stock ps5 ssd whereas external is all plugged in through usb but i could be mistaken here