The iPod has become a part of the global culture, since its first introduction in October 2001. The portable music player and others of its kind have left their mark on society and social behavior. Many have gotten curious and wondered, what exactly is inside an iPod?
For an iPod video, here are the main hardware components contained inside the case.
There is a hard drive, of course, for storage. This hard drive is a 1.8 inch Toshiba one with 30, 60, or 80 GB capacity. It features a USB interface, and runs at 4200 rpm. It weighs only 1.7 ounces or 48 grams and manages to fit 30 GB (or more) onto a single platter. This comes to about 93.5 gigabits per square inch. This high density is made possible by the use of smaller, lighter sliders, as well as improved thin-film technology with higher sensitivity for the read/write heads and the platter.
Then there is a rechargeable lithium-ion 700 mAh, 3.7 V batteries, a typical battery using the latest technology to make it fit the iPod’s form factor with maximum performance.
Then of course a 2.5 inch TFT LCD. This display is 16-bit and has a resolution of 320×240 pixels. It is also extremely thin, measuring only 0.125 inches or 3.175 mm in depth.
The chips and other processors such as the Broadcom BCM2722 video chip and the Wolfson Microelectronics WM8758 codec are found on a single motherboard. Because of the iPod’s smaller size, these chips use thin-film technology to connect to one another instead of the plastic connectors that larger devices usually use.
Perhaps the most interesting hardware in the iPod is the click wheel mechanism. Incorporated into this mechanism are five mechanical buttons corresponding to play/pause, forward, backward, menu, and the middle select button. These work much the same as other electronic buttons: by pressing them, metal contacts are made which complete the appropriate circuits on the motherboard.
The touch-sensitive wheel itself works much like a laptop’s touchpad does. In fact, Synaptics, a company widely known for its production of laptop touchpads, provided the touch wheels for the 4G iPod. (But Apple came up with its own proprietary design for the 5G iPod’s clickwheel.) The main concept behind this touch-sensitive hardware is that the touch of a human finger (or anything else that might conduct electricity) induces a change in the capacitance of the mechanism, which can be tracked via a built-in grid.
What software is then used with this hardware, to complete the iPod unit? The iPod 5G reportedly runs on the Pixo OS 2.1 operating system. Along with this comes PortalPlayer’s Digital Media Platform, which includes support for audio decoders, firmware customizations, as well as other software development tools. And of course software for the corresponding video and audio chips come installed on every iPod.
http://www.frozenipod.com/2007/whats-inside-your-ipod/#more-11
