Ken Kutaragi, Sony Computer Entertainment president, said the PlayStation 3 hard drive will use the Linux operating system, so it will be recognized as a computer rather than just a console. But a HDD will likely be an optional feature of the PlayStation 3.
Further comments seemed to indicate that there will be more than one model of optional add-on PS3 HDDs available at launch. "We've added a 2.5-inch HDD bay so that users can equip HDDs, such as 80GB and 120GB, even though that's still not enough [capacity]." By contrast, the Xbox 360 will ship with a 20GB hard drive, standard. No other 360 HDD models have been announced, although Microsoft officials have indicated larger-capacity models could be produced if needed.