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CD versus DVD

 

 

What is it used for?

Entertainment and data storage.

 

What's nano about it?

The distance between the circular tracks of information on a CD is 1.6 microns.

The distance between the circular tracks of information on a DVD is 740 nanometers.

The information on a CD could be straightened out into a line that is over 3 miles long.

The information on a DVD could be straightened out into a line that is 7.5 miles long.

The bumps that make up the information on a CD are 0.5 micrometers wide.

The bumps that make up the information on a DVD are 320 nanometers wide.

 

How does it work?

By making the distance between the tracks smaller you an squeeze the lines of information closer together and therefore put more information in the same disk size. Making features smaller allows you to put more in a given space. This increases the functionality per square centimeter of the disk or another device.

 

 

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Technical and educational staff services are possible through the generosity of the National Science Foundation through support via the NNIN.