I think theres a way to open it up. This is purely an assumption based on the Install to HDD feature in the options of the game. It installs 8GB (if memory serves me correct) to your HDD. I have to assume thats coming from the .VOL file. If that file can be extracted and the proper files put in the proper place it might be possible to run it from an external.
I personally havent even looked into it myself. ive had other tasks that are much more important. Plus the recent video showing that the PS3 doesnt use any special secret format means it would be a waste of time imo.
Ill just wait till we can change the format of the EHDD and run the games perfectly from there. I expect the PS3 to be no different than the Wii at this point. With CFW and near perfect EHDD compat.... If not more so
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