Earlier quoted context omitted.
Funny that both devices cannot really be made without air in them. That first iPod had a hard disk. Hard disks have disk heads that float on air. Typical lenses aren't flat at the back; CCDs or films are. You could fill that void with glass with a different index of refraction, but that would only make the thing heavier, not smaller.
> That first iPod had a hard disk. Hard disks have disk heads that float on air. Hard disk drives are sealed, you're not going to get much air out of dropping an HDD (especially a 1.8" one) in water.
Even more amusingly, hard drives need that air inside to operate and they won't work at high altitudes.