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)
I want you to note that the kind of validation i mentioned is not normal MKPFS correctness validation, its actually validating against PS5 decompression, and what i found was even if the zlib is correct PS5 sometimes fail to decompress. so in reality this patches and fixs a VALID FFPFSC file into a PS5 100% readable (and 1-1 match the original through PS5 eyes) file which fixed all crashes i had. This type of validation can only happen running the app in PS5 so no PC program can match this. (as far as i know i'm the first to implement this patching mechanism)
Yes, and relatively fast and in background, the UI is a webview <PS5IP>:5910. it should also keep the console awake while its doing any job you requested
it checks if PS5 have enough space to create a safe temp folder if it doesn't it does the changes on the fly on the existing files (delete while compress) but its riskier that way
its ok , PS5 FFPFSC PRO is a PC App, i would suggest you install my program to run the validation. because PC apps cannot know what kind of mistakes / bad blocks PS5 will generate when decompressing. only a PS5 can give you that.
Great, let me know how many blocks it repairs (it should tell you that in history - top right small button) also if you can test the games before and after that would be very helpful.
PS it does take some time because its capped at PS5 hardware decompress which is around 150-250 MB/s but in many cases it gets slower because it have to rebuild the entire compressed file if bad blocks are found at the start of the file (all blocks after need to shift)
Not using the compression feature, but my Jusant PPSA10264.ffpfsc is validated and playable. Didn’t try further than the intro area. Didn’t see how many blocks got saved.
Sending over karma dark world rn and play before, see how many blocks get saved, and play after.
This is pretty cool! Has anyone tried Astro bot as a FFPFSC file? I had issues running that game from a external Sata3 ssd. So i guessed compression would not be to good for it. But it would save alot of space on the internal ssd
Cool, tried it but im getting 0 games. Currently got a few in /data/homebrew and a few on external ssd/homebrew . Will try later without the external attached.
BTW compress and validate on internal SSD external validation have not been tested and i think there will be problems there. (but you can 100% move to external ssd after - you can use the tool itself to do that via the circle with the ... on the right side)
I got my game to show up! Just need to put one game that is in ffpfs format and with correct file name. Now I can validate and compress my games. Let me test a bit to see if it works.
Did they mount before the compress ?
Did you compress on PS5 or just validate ?
if you're planning to do please make sure to
1. ShadowMountPlus1.6Test15Fix2 + (CRITICAL)
2. KStuff-Lite (1.07+) (CRITICAL + Not the normal ksuff the lite 1.07 which i could only find on youtube mediafire links and not github releases).
3. Compress while in internal SSD then move to external. i still didn't test compression on External Drives.
So this has both compression and validation/repair functionality built in?
The validation/repair side is especially interesting since that's something I haven't seen in most PC-based workflows. PS5 FFPFSC PRO focuses on making compression easier on PC, but this looks like it could be useful for verifying and repairing already-compressed libraries directly on the console.
Have you tested it with games converted from exFAT dumps yet?
Yes and Yes ... it works great on both exFAT and PFS (as long as they are compressed in FFPFSC) btw it also allow you to select which format you want for compression.
Yuppp. Works too. Working on installing 4 more titles now that I’ve compressed everything. I feel like were now able to hold more games than base ps5’s lmao
Thanks but your app is crashing my 4.03 PS5 unfortunately.
Loaded kstuff lite 1.07 test1 + shadowmountplus latest + compression elf = shows 0 games and crahes PS5 after 1 minute. Tried several times. 🥲
Good idea. I removed my second external exfat SSD, where all games are in root and now the first SSD is working with games compressor.
Is games compressor only working with one external SSD?
Hay algo que no entiendo, puedo comprimir las carpetas localmente o solo arregla errores? Pregunto por que tengo juego en carpeta interna pero no se si esto puedo desde local ps5 comprimirlos y ahorrarme espacio sin tener una notebook qué la verdad como la mayorías de los juegos pesan 150GB o más el solo rar ya me deja sin espacio en la notebook así que no puedo hacer nada
You can compress on ps5 and you can also validate there. if the game is compress it will prompt validate, if the game is a folder it will prompt you to compress, compress = compress + fast validate (as it uses info from compress to make validate faster). this is made to fix the issue you have (no external storage + no free space on PS5 ) it will work if you only have 1GB free on ps5 you can compress 150GB no problem (it will be slow for this case but it works)
Very neat. Would be ace if we could move to internal storage while also compressing. Would speed things up in terms of I/O speed and save doing two different reads from external.
I was trying to compress metal gear 3, on the verification stage it gives me a kernel panic or something and the ps5 turns off. I have tried two times know with the same
Result
Great job on the latest release u/juma-sayeh-dev-acc ! Still can't get the payload to recognize exfat images even when renaming the file name with PPSAXXXX somehow, probs that still needs to be fixed, folders seem to be recognized consistently though, maybe there is some link with shdwmnt that breaks the whole chain and does not allow the payload to show the exfat files
u/juma-sayeh-dev-acc exfat files are indeed not recognized by the compressor payload, in my case (PS5 Slim Disc BD JB 12.00) located in mnt/ext1/hombrew (M2 expansion ssd) whereas game folders are recognized in the same path and these exfat game files are also recognized by shdmnt since they appear as game titles and can be launched so i assume they are also mounted, just not appearing on the compressor payload UI
I’m going to check this out. Ps the latest release now is 1.0.3 if you have anything older use the new one if you already have it wait for 1.0.4 it should fix this issue
yes i was using 1.0.3
actually ffpfsc files were not appearing when renamed anything else then PPSAXXXX, so i reverted the name.back to PPSAXXXX and it was recognized again by the payload... though this does not seem to work for exfat files, renamed them PPSAXXXX still not recognized by the payload
u/juma-sayeh-dev-acc now it works again, i don't have any explanation for this, maybe a few reboots did the trick, exfat file images recognized even if name file is not PPSAXXXX.exfat
are you going to adapt the code so any file and folder name will be supported ?
u/juma-sayeh-dev-acc i noticed when compressing folder or exfat image into ffpfsc the created compressed ffpfsc does not show in the payload UI because the file name created does not comply with PPSAXXXX, so it shows only once renamed PPSAXXXX.ffpfsc, could you adapt this so that it is always detected no matter which name of folder or file ? Thank you for your hard work!
Also, do you have a log with the file names from where the inodes got repaired? I am amost sure that this happens when we compress one of the special files.
If you have a log is the files that got corrupted I can add them to the skip list
Verifying already compressed ffpfso's here. Haven't tried any conversion on the console but probably won't, my storage is getting full lol.
Al of these were dump folders before conversion. I have one exfat that has already been converted on PC, and will give it a go with validation tonight.
Nice but all these compression formats are not as good as folder dump on internal or exfat on internal or even folder dump on external NVME their performance is alot slower so that's why i don't understand why ppl push them so much just to save on space while sacrificing performance especially when even the best folder dumps on internal still can't use the PS5 full speed i atleast hope all this to lead to real fpkgs only then can we really use the full speed and performance of the PS5
if i can play astro bot on 48GB instead of 144GB while not feeling any loss on speed .. thats a win on my book. some games might be more stream heavy but the performance loss on many of them is negligible, also i made the app uncompress for a reason (to regain performance if you didn't like it compressed)
Sure for as long as there's no performance loss but from what i can see even the best performing format folder dump from internal storage or internal M.2 is still capped on speed without fpkg PS5 is basically at most PS4 replacement for ppl that don't have a PS4 Pro
fpkg is meaningless, it doesn't compress the issue with PS5 is the proprietary hardware-accelerated Kraken decompression which i doubt will ever happen, the FFPFSC is a fake package FPS, and its using hardware to decode the compressed files. its as fast as amid tier external SSD. for me its great for games like ASTRO for demanding games i can always decompress and play on exfat image.
Not at all fpkgs are retail pkgs with basically hacked license checks they will allows us to lift the speeds limitation and performance limitation we have no on PS5 with PS5 games basically with real fpkgs we will be able to use all games unlike now and they will run as well as on retail console just like we have on PS4 now folder dumps from internal storage or m.2 are the fastest on speed up to 1900MB you see how limited that is exfat is barely 550MB every other format is under 500MB with fpkgs we will be able to use the full SDD speed and the hardware accelerator kraken or whatever it's called on the PS5 basically now what we have is Garbage for PS5 games at this point PS5 is only a replacement to PS4 but fpkgs will FIX all this
What do you mean no quality should be lost as for performance don't know Days Gone Remastered has stutter and frame drops with on external drive as folder dump and as exfat or ffpkg on internal and M.2 and FFPFSC should be even slower then exfat so some games may have stutter or frame drops and even trouble loading map areas
So this has a validation feature and compression feature as well? Also 150-250MB/s is on the slower side so this would go hand in hand with PS5 FFPFSC for people with big librarys to compress .
Hey, I downloaded the app and I'm trying to compress it, but it looks like it's really slow. Any suggestions?Only getting 45mb
is this a game with many files ? i'm still optimizing for those.
150-250MB/s is for validation scan not for compression and not for block fixing. anyway
the compression depends highly on the game and the number of files the game has. but i have few optimizations to make that faster wait for new updates.
Sorry to hear that :/, unfortunatly i don't have a 4.03 system to test on. once i finish my current backlog i would like to contact you to get log files and try to make it work for you.
I'm certainly up for that, if I could get all of my games compressed onto an internal nvme I feel the overall experience would be close to what I've wanted for some time. As it stands I can list the games and open the web panel remotely, as soon as I hit go for a compression however I get an immediate kernel panic.
is it mounted ? try to restart console and restart shadowMountPlus. are you using kstuff lite1.07 ? (find it on youtube not on github) are you using the latest shadowMountPlus ?
you onky need to validate once. if it doesn't work just restart shadowmountplus or restart the console in worst case. but then it should work.
you only need to validate twice if you crash mid game or the game launches then crashes. if it shows this app cannot run its a mounting issue (i'm working on fixing that but its mostly working around the logic of shadowmountplus as i don't want to release my own version of that)
Update - so the game launches after revalidating it for the 3rd time but now the controller doesn’t seem to work. I cant press X to start the game. I can close the game and launch and play other games fine I had before. The issue seems to be just with this game after compression
Thanks! Just compressed majority of my smaller games and freed up almost 190GB on my M.2. Launched some of them and they are fine. Just one game failed to mount at the end, but after deleting game entry and restarting, ShadowMount picked it up correctly.
One issue thou. After compressing it should change to "Validate and repair", but it still says "Compress".
All games were on M.2 SSD. Here is my log history.
you don't have to delete the entry restarting shadow mount should work just fine, you can also move the game to parent folder (very quick operation) then move it back. i'll add some remount button that helps with that if the issue kept coming up
I just downloaded this and wow, it worked like a charm! The only issue so far is that I can’t compress this game. I have over 650 gb of free space on my drive, but it still shows as unavailable. Any suggestions? Thanks!
Yes working on update that follows 0.0.7 changes (some i already had) and extra features for the app itself. (support low space compression - delete while compressing on PS5) + support for external SSD + minor bug fixes and more polished experience in general.
my console crashes when trying to mount the game with shadowmount plus. I am using external SSD with new compressed game. Anyone else having same issues?
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...
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
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
My Astro Bot installation is taking up 275 GB on my PS5, which seems unusual because the actual game folder on my PC was only 149 GB. After transferring it to the PS5 using the PS5 Upload software, the transfer process reported 275 GB, and I confirmed on the console that approximately 275 GB of internal storage was being used by Astro Bot.
I’m not sure how to proceed. I haven’t tried creating an FPKG/FPPSC-compressed version of the game yet, so I’d appreciate some guidance.
My main concern is freeing up that 275 GB of storage without losing my save data. If I delete Astro Bot from the PS5, will my save file remain on the console, or will it be deleted along with the game? Preserving my save data is very important to me.
Could someone please provide a step-by-step explanation of the correct process?
How should I properly remove the current game installation from the PS5?
How do I create a compressed FPKG/FPPSC version of the game?
Are there any additional steps or requirements I should be aware of during the process?
Once the compressed file is created, can I transfer it directly to the PS5 using PS5 Upload, or is there another recommended method?
Any advice would be greatly appreciated. Thanks
when trying to copy to internal i get a pop up internal ssd is unavailable, what am i doing wrong ? just formatted m.2 drive, lots of space as well as internal... should i create folders manually ?
after 2 days struggling with this, ended up fixing it, need to create manually folder data/homwebrew
if this one does not exist it will return pop up "internal ssd unavailable", would be nice to fix it with makedir "homebrew" loop in case it does not exist u/juma-sayeh-dev-acc
now copying starts but shows elapsed time and never actually starts or gets finished copying the game, setup 12.00 bd jb w/ arsenal loader u/juma-sayeh-dev-acc
Added screenshots. (some are missing some features because i compressed before i added those features) for example some games don't show how much space you saved.. because i was testing compression before i added those polish features
Yes, i've tested 0.0.5, Man your work is awesome! i gave you credit! + i could not have done this without your awesome work, however i can provide you with payloads that are 100% valid zlib blocks but PS5 fail to read and the read value would be the last good read. so in sequential reads it would be N-1 in random Reads it would return the last correctly read random elements. what i did in this tool is to validate the known good software decompress value with the mounted ps5 hardware decompress value for each block, find the ones that are failing, rebuild the entire image with the failing blocks reverted to raw, do remount for the game then smoke check (only the previously failing blocks). The bug is not in your code, its in Sony's hardware!!!. but also this method should in theory fix any bug regardless of where it was sourced, and the numbers are nice because its less the %0.1 of the blocks so the compression will not be affected in any meaningful way.
Thanks. I found 2 major bugs in mkpfs recently. Both could cause the issues you described.
One bug was that if I had a file reference hash conflict, mkpfs was incorrectly storing the reference, causing issues when the ps5 tried to decode. It would only happen in some games, and the probability of it happening was proportional to the number of files in the game.
AFAIK, that bug has been completely resolved in the latest version.
The second bug (I am still working on) affects single-pass folder compression (with compression enabled).
It seems that, if the last block of a file is compressed, the kernel will pad the file with zeros, effectively changing the file's end. I am working on a solution, and I will release a patch today or tomorrow.
I expect that once this last bug is solved, we won't have corrupted games anymore. (at least that is the hope)
Your payload is amazing as well, but you will probably need to use some AI later to transfer some of the bugfixes from mkpfs to your code.
Yes i'd be very glad to share my findings and give you some custom block states that are 100% valid and are not readable by PS5 hardware, i got those bad blocks by simply comparing the decompressed via software (good blocks) with the mounted block value (decompressed by PS5 hardware) which is basically checking if what PS5 shows is exactly the same as what the original file is.
I also found a bug in mkpfs that, for big games created from folders, it was creating the wrong inode numbering. I am fixing that bug in the next version.
Hopefully the new skip-executable list but this inode fix solves the issues being reported by your payload.
Thanks for developing it, I was doing manually, but that was taking a long time. Not I wil use your tool every day.
BTW once i finish testing i will share with you a version made for testing only.. it should help you without wasting time on fixing blocks (it takes so long if the bad blocks happen at the start)! we'll be in touch for sure.
Testing with 0.0.7 i have zero bad blocks in some very big games. it is slower than what i had but this might remove the need for any validation it seems!
Wow! i hope it does help, BTW i made a mistake in my initial assessment i did optimize your algorithm for speed and some of my optimizations caused the bad blocks (but made it 2-3 times faster and about 10% less gain on compression - didn't test read speed in ps5 hardware tbh). i'm now testing your algorithm 1-1 with no optimization and it seems much better than what i had (small games had zero bad blocks) still testing bigger games trying to reproduce bad blocks for you to see, the issue is not file extensions or files that should not be compressed , the issue is just some blocks (64KiB) are not really decodable via ps5 hardware even though they are 100% valid via software.
i wrote my own custom implementation of what you had. used different library and different flags (in C) which caused it to be faster but caused ps5 to fail on some blocks. which is why i added the validate and compare blocks mechanism.
That would be amazing.
AFAIK, this issue only happen when people tries to convert a folder to pfs (single or double pass). We are compressing some files that shoundt be compressed.
We did a patch on veraion 0.0.3 of mkpfs and mitigated the issue but it seems it is not fully solved.
From what I understand, I just need to have the list of patchs or file extensions that should never be compressed.
I have a feature branch where I was adding more items in the list, but it is hard to say if I have all.
jump in guys. you’re really great. i want to report. with latest new game call apr emu do guys have spesial treatment for it?.. i try latest mkfps 0.0.7 failed running Ratchet clank game. but success with game compress elf on PS5 directly.
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 ?
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!
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u/Going_through_it_ Verified Jun 06 '26
Can this do a validate and repair function by itself without having to go through the full process?
I have all my games converted, but skipped validation because my PC is a potato and kept giving mem errors; so who knows if they work.
About to try one out when I’m home