To quote: Due to FAT32 limitations users needed to run these games from internal hard drive only. However, it seems that isn't the only option anymore. Many games utilize a file format known as PSARC (*.psarc).
These files ending in .psarc are archive files similar to zip or rar files on PC. By extracting these large archive files and using the smaller files that are inside, users can get stay under the 4GB limit.
This method has been tested on Uncharted II, and will only work on games utilizing the psarc file format.
1) Download PSARC.zip PlayStation Archive Utility (or the PARC GUI v0.1 or the PARC GUI v0.2 update by TeamKidneyBean if you prefer).
2) Extract zlib.net.dll and PSARC.exe to any folder.
3) Find any files more than 4Gb for example /PS3_GAME/USRDIR/build/main/pak22.psarc (5,596,444,529 bytes)
4) Copy pak22.psarc into zlib.net.dll and PSARC.exe directory.
5) Extract pak22.psarc (just drag-n-drop pak22.psarc to PSARC.exe)
6) Now copy pak22 folder with extracted files to gamefolder /PS3_GAME/USRDIR/build/main
7) Now you can delete pak22.psarc.
8) Copy PS3_GAME folder with game to your external fat32 usb hdd GAMEZ/Uncharted2/
9) Use Backup Manager to load game, should work fine.
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I tried something similar back before the PS3 was hacked. I was trying to find a way to transfer >4GB videos from the PS3 to a USB drive, so I thought the PS3's own format would be an obvious choice. Unfortunately, it didn't work -- the PS3 wouldn't mount the USB drive when in that format. If that has secretly changed in one of the updates, that is pretty interesting.
Regarding your question, I think the difficulty of creating such an app would depend on some unknown factors. The internal HDD is per-console encrypted, and while we already know how to retrieve those keys and do the decryption/encryption, it adds some complexity.
The PS3's built-in format utility targets the internal drive and it may or may not be written in such a way that it could be patched to target USB instead. If you had to write your own utility, you'd need to figure out the partition structure, which as far as I know, nobody has done yet.
i am new to both ps3 and jailbreak. is it best to use a external drive for the jailbreak or the internal drive? i should have my amazebreak dongle in a few days. i have updated to 3.41. if i use a external drive do i just format to fat 32?