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usrevenge said:
PS3 are usually 10-50GB, most are about 15GB. but in reality most of the disk is constructed with back up sets of data so it can read faster... I wouldn't honestly trust the actual size of a game unless it is downloadable from the PSN store.

In terms of actual game content most PS3 games will mirror the X360 version (some of them I think have less compressed sound) and it's rare X360 games go over 1 disc (ie 8.5GB)