Question

What is a secondary memory? Explain capacity, density and speed of hard disk drive.

19 Feb 2025
Answer :
Word Count : 1337

Secondary memory, also known as auxiliary memory, is a type of non-volatile storage that is used to store data and programs permanently. Unlike primary memory (RAM), which is temporary and volatile, secondary memory retains its data even when the power is turned off. This makes secondary memory an essential part of modern computing systems, providing large storage capacities for long-term data retention. Hard Disk Drives (HDDs) are one of the most commonly used forms of secondary memory due to their cost-effectiveness, reliability, and relatively large storage capacities.

### Capacity of Hard Disk Drive (HDD)

The capacity of a Hard Disk Drive refers to the total amount of data that the drive can store, typically measured in gigabytes (GB), terabytes (TB), or petabytes (PB) for large-scale enterprise systems. The capacity is determined by several factors, including the number of platters (disks inside the drive) and the areal density of the data storage. Over the years, advancements in technology have allowed hard drives to store larger amounts of data on smaller physical spaces, resulting in significant increases in capacity.

Modern HDDs commonly range in capacity from 500 GB to several TB, with enterprise-level systems offering capacities upwards of 20 TB. The size of an HDD is influenced by its intended use case. For personal computing, drives with capacities between 1 TB and 4 TB ______ ______ _______ _________ ________ __________ _______ ________ ______ ____ ____ ________.
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