Here we can see the lower back of the Zune HD with its back cover removed. At the center you can see an Nvidia-branded chip, which is likely the Tegra processor the Zune HD uses to achieve new features such as HD video playback and improved battery life.
In this shot we see the back of the Zune HD with the back cover removed (shown at right) and the rechargeable battery pack in place. It's interesting to see that the back cover uses a two-piece design (a smaller plate--possibly made from plastic for improved Wi-Fi reception--is found on the bottom).
Also interesting is the inscription on the inside of the back cover "For our Princess." Is Microsoft writing love notes to the FCC?
Here we see the flip side of the smaller board connected to the Zune HD's dock and headphone output. Two chips from RAM manfacturer Hynix can be seen here, as well as a chip bearing the Wolfson logo, a manufacturer that specializes in audio chips.