• Hard drive - 30-GB Toshiba 1.8-inch hard drive
• Battery - rechargeable lithium-ion (700 mAh, 3.7V)
• Click Wheel - navigation via touch-sensitive wheel and mechanical buttons
• Display - 2.5-inch TFT LCD
• Microprocessor - PortalPlayer PP5021C with dual ARM7TDMI cores
• Video chip - Broadcom BCM2722
• Audio chip - Wolfson Microelectronics WM8758 codec

The case actually isn't that difficult to get into -- we used a 6-inch metal putty knife to pry apart the seam. Once you see that you need to get the knife under the thin edge of one side of the casing (instead of driving it straight down), it comes apart pretty quickly. Here's what we saw when we pulled it apart:

This iPod video uses a 30-GB Toshiba 1.8-inch hard drive (model MK3008GAL), featuring 4200 rpm and a USB interface. It weighs 1.7 ounces (48 grams) and fits 30 GB onto a single platter, squeezing in 93.5 gigabits per square inch. To fit so much into so little space, the drive uses smaller and lighter sliders (which keep the right spacing between the read/write heads and the recording surface) and a more sensitive thin-film technology on the heads and the platter. The increased sensitivity allows for a greater number of recorded bits per square inch.

When you remove the front casing, you're looking at the LCD, the motherboard and the Click Wheel:

The Click Wheel is a section unto itself, and we'll deal with that technology on the next page. Let's start here with the iPod video display.

The display is a 2.5-inch, 16-bit, TFT LCD. It has a 320x240-pixel resolution and a 0.156 dot pitch. The screen is incredibly thin -- just 0.125 inches (3.175 mm) deep.

The connectors used in the iPod are miniscule. Instead of the plastic connectors you find in larger devices, the ends of the wires that connect the various components of the iPod are coated in a film that stiffens them to create a viable input. Here you can see where the LCD connects to the back side of the motherboard (with a U.S. dime for reference):

All of the chips and memory devices that make an iPod run are situated on the motherboard. Here's the front:

And here's the back:

In the image above, you can see the Click Wheel controller. A "mixed-signal array" is a chip that can deal with both analog and digital data. In the case of the Click Wheel, the controller has to accept analog data generated by the movement of a finger over the surface of the wheel and turn it into digital data the microprocessor can understand. Let's find out how it does that.