WTF are you talking about PSARC won't work. It is what you have to use to get it to work on an external HDD. Extract the two psarc files (with PSARC, PSARC means PS Archive and is the PS3 version of winrar) and the two folders you get put them where the psarc files were and play. Takes up more space this way but at least it is on an external.
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