An iPod nano with 8 GB

On the website of Multiarcade is shown how to double the capacity of an iPod nano 4GB to reach 8GB.

You simply need to solder a second 4GB NAND chips to the dedicated location.
In this case, the second chips was recovered from an broken nano.
The overall capacity of the modified iPod nano is 7.4GB.
Apparently it is clear that Apple has already planned future development for the iPod nano storage capacity, and will release upgrades if competitors are capturing too much market shares, or simply when the NAND chips price will have still decreased.