Ok, crazy question, after all this time still unsure.
So if I'm playing a game using Multiman, the game is on the external hard drive or internal hard drive, is disc in the drive being used? Or is it like playing the game from the XMB? Is playing a back up for 2hrs the same as playing from the actual game disc?
If you launch the game from the disc icon at the xmb then the disc gets used to fool the ps3 at launch. The disc, after launch, in not used at all as the files, the game your playing uses, are on external/internal hdd.