Okay, let's assume that one-fifth of iPods are still active. That would bring us up to about 100 songs per iPod. That's about 500MB worth of music. Even the first generation iPod had 5GB of storage. Jobs (and I) could be wrong about the disk utilization of the iPods, but I doubt that it's even as low as 10%, much less the 2% that today's low-end capacity models would make it.