i dont know why some games only run from the intenal drive. but this tool helps those who dont want to ftp games across.
i am running psgoove 1.1 and OBM 1.13 and uncharted2 runs fine split up on my external hdd.
this is so you dont have to ftp your games across from pc to PS3. some games like motorstorm2 only run from the internal hdd. uncharted to which has a pak22.psarc file needs to pe split up so you can put it with the split files on an external hdd and this game runs from the external drive and internal.