The volume of data in a single file or file system can be described by a unit called a byte. However, data volumes can become very large when dealing with Earth satellite data. Below is a table to explain data volume units (credit Roy Williams, Center for Advanced Computing Research at the California Institute of Technology).

Kilo- means 1,000; a Kilobyte is one thousand bytes.
Mega- means 1,000,000; a Megabyte is a million bytes.
Giga- means 1,000,000,000; a Gigabyte is a billion bytes.
Tera- means 1,000,000,000,000; a Terabyte is a trillion bytes.
Peta- means 1,000,000,000,000,000; a Petabyte is 1,000 Terabytes.
Exa- means 1,000,000,000,000,000,000; an Exabyte is 1,000 Petabytes.
Zetta- means 1,000,000,000,000,000,000,000; a Zettabyte is 1,000 Exabytes.
Yotta- means 1,000,000,000,000,000,000,000,000; a Yottabyte is 1,000 Zettabytes.

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