Computer disks must be prepared and organized before information can be stored.  Formatting a disk creates the "template" by which data can be stored and retrieved.
 

Explanation:

The word format means the organization plan, style, or type of something.  To format a disk means to organize it into storage units.  To format a document or font means to arrange the style.  You can also format files, programs, and other computer related items. 
 
 

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Look up "Format" in the TechEncyclopedia.

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