I'm not sure but I think it may have something to do with how the parts in the PS3 are all "married" together. You can't just hot swap drives easily and instead have to switch out one of the circuit boards from the original drive into the new drive to make it function. The way I understand it is that a lot of the information dealing with the system identifying parts and determining functionality is lost when the CMOS dies. The system is basically reset to an almost "pre-factory" setting when you replace the CMOS. In order to restore the systems full functionality it has to connect to the network at least once in order to run updates that will restore everything, including the ability for the system to communicate properly with the disc drive. Otherwise you basically just end up with a fancy paperweight.
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