Apple iPods Changed the Way we Listen to Music

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iPods have positively influenced the way people all over the world listen to and share music in the blink of an eye. Since Apple introduced the first iPod in 2001, 350 million iPods have been sold as of September 2012. That’s enough iPods for every single person in the United States to have their own device with twenty million still left over. Those are some pretty staggering numbers, considering more iPods are sold every second.
The iPod has seven main parts: hard drive, battery, click wheel, display, microprocessor, video chip, and audio chip. Older models of the iPod (with the click wheel) have a hard drive. On the inside of the device, the hard drive is made up of platters, spindle motors, heads and head actuators. Platters are little disks that are covered with a magnetic surface and then placed on a spindle. The disks have a cobalt alloy substance applied to them which is placed on the platter by electroplating. Digital information is stored on the disks and information is written on the disks by electromagnetic flux through “read-write” heads that change the polarization. As the platter rotates, the magnetic fields move and the “read-write” head senses electrical change between the moving magnetic fields.
The iPod has a small Liquid Crystal Display (more commonly known as an LCD). The molecules in the liquid crystals in the screen go through multiple changes, one being the nematic phase. The twisted nematic is manipulated when the electric current is applied to it.
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