[Someone]

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.

[masklinn]

> 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.

[keenerd]

Hard disks are not sealed. Disks from the 1960s were. Then engineers realized they could dramatically reduce the amount of structural bracing if they left a "breathing hole" open and allow air pressure to equalize. This is why all hard drives have that little 2mm dot labeled "Warning do not cover!".

Even more amusingly, hard drives need that air inside to operate and they won't work at high altitudes.