If the file is split you can't play them from an external HDD, the splitting it for storage use only. I ran into this using one manager to split then used another to transfer the files back and they weren't compatible with the way they split files. So they were still split so keep in mind no all splitters are made equal. So when you choose one stick to it. I repeat YOU CAN'T PLAY SPLIT FILES FROM A USB HDD!! if a game requires to be split then in order to play the game you must transfer it as a whole to the internal HDD to play.
PS3 CECH-2501A [CFW] & CECH-3001 [OFW]/ PS2 SCPH-3901 & SCPH-7501/ PS1 SCPH-5501
Mod Cobra 4.46 v7.00 w/ E3 Flasher [CFW] & Cobra ODE 4.50 [OFW]/ Mod HDD-OSD [Phat] & Modbo 4.0 [Slim]/ Mod MM3
HDD 1tb [CFW] & 640gb [OFW]/ HDD 640gb & OPL v0.92 w/ 1.5tb SMB