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ICT Class 9 - Memory Storage-Devices Notes

Comprehensive study notes for Class 9 - Memory Storage-Devices olympiad preparation

Memory & Storage Devices

Welcome to the chapter on Memory & Storage Devices for Class 9. In this chapter, you will learn about different types of memory and storage devices used in computers, their functions, and how they help store and retrieve data. By the end of this chapter, you will understand the difference between memory and storage, and know about various devices used for storing information.

Introduction

Computers need memory and storage devices to work. Memory is used to store data temporarily while the computer is working. Storage devices are used to save data for a long time, even when the computer is turned off.

Types of Memory

  • Primary Memory: Also called main memory. It is used by the computer to store data and instructions that are currently being used.
  • Secondary Memory: Used to store data and programs for a long time. It is also called storage.

Primary Memory

  • RAM (Random Access Memory): Temporary memory. Data is lost when the computer is turned off.
  • ROM (Read Only Memory): Permanent memory. Stores important instructions needed to start the computer.

Secondary Memory / Storage Devices

  • Hard Disk Drive (HDD): Main storage device inside a computer. Stores large amounts of data.
  • Solid State Drive (SSD): Faster and more reliable than HDD. Used in modern computers and laptops.
  • CD/DVD: Optical discs used to store music, videos, and software.
  • Pen Drive (USB Flash Drive): Small, portable device used to transfer and store data.
  • Memory Card: Used in cameras, smartphones, and tablets to store photos, videos, and files.
  • External Hard Drive: Portable device used for backup and extra storage.
  • Cloud Storage: Storing data on the internet using services like Google Drive, Dropbox, or OneDrive.

Difference Between Memory and Storage

  • Memory (RAM): Temporary, fast, and used while the computer is working.
  • Storage: Permanent, used to save data for a long time.

Fun Activity: Identify Devices

Look around your home or school. Can you find a pen drive, memory card, or external hard drive? Ask your teacher or parents to show you how they work!

Summary

  • Memory and storage devices are important parts of a computer.
  • RAM and ROM are types of primary memory.
  • Hard disks, SSDs, pen drives, and cloud storage are used to store data for a long time.

Practice Questions

  1. What is the difference between RAM and ROM?
  2. Name two secondary storage devices.
  3. What is cloud storage?
  4. Which device is used to store data permanently?
  5. Why is SSD faster than HDD?

Challenge Yourself

  • List three advantages of using cloud storage.
  • Draw and label any two storage devices.

Did You Know?

  • The first hard disk could store only 5 MB of data!
  • Modern pen drives can store hundreds of gigabytes of data.

Glossary

  • Memory: Temporary storage used by the computer while working.
  • Storage Device: Device used to save data for a long time.
  • Cloud Storage: Saving data on the internet.
  • SSD: Solid State Drive, a fast storage device.

Answers to Practice Questions

  1. RAM is temporary memory; ROM is permanent memory.
  2. Pen drive, hard disk (any two: SSD, CD/DVD, memory card, etc.).
  3. Storing data on the internet using special services.
  4. Hard disk, SSD, pen drive, CD/DVD, etc.
  5. Because SSDs have no moving parts and use flash memory, making them faster.

Explore different storage devices and see how they help you save your work and memories!

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