How to use your Hard disk (Making partitions)

When you buy a new Computer with Hard disk. Or only Hard disk you must know how to use it by means of making it partitions.  

Example: As a consultant, I come across many users my customers, some of they don't know what is the hard disk in their computer, and some customers they know but they don't know how is it organized. Many times suppliers they prepare systems and supplied.

First Step 

        Second Step 

        What happens if I don't follow above tips ?

Here are some answers:

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By Venkatraju Consultant Technologist