Fig. 1: Representational Image of a Hard Disk Drive
Have you ever given it a thought what happens when you double click on an icon of application or some file. During the course of time this operation is performed, you might see flickering of light associated with hard disk and listen to churning sound of hard disk. This definitely means that something is going on inside, rather one might correctly guess that data is being accessed.
To understand this first we need to understand, what is hard disk, how it stores data and how does it access the data.
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