CLASS 4//SUBJECT-COMPUTER/LESSON 3/COMPUTER MEMORY AND STORAGE DEVICES

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LESSON 3

COMPUTER MEMORY AND STORAGE DEVICES

 

1.    How is a DVD different from a CD?

DVD is similar to CD in shape and size, but it can store a huge amount of information. The storage capacity varies from 4.1 GB to 17 GB.

 

2.    Distinguish between RAM and ROM?

RAM is the working memory of a computer system. RAM is a temporary memory. When we turn off the computer, the RAM loses all the data. ROM is known as permanent memory and cannot ordinarily be changed. It contains instructions and programs for computer operation. The content of ROM does not get lost when the computer is turned off.

 

3.    What do you understand by computer’s memory?

The memory of a computer is broadly divided into two parts. They are primary memory and secondary memory. Primary memory can be divided into three parts. RAM, ROM and Hard disk. Secondary memory storage devices are CD/DVD and Pen Drive.

 

4.    Write a short note on hard disk.

It is the main storage medium for computers. It can hold large amount of data. It is made up of hard platters of metal. Data is recorded on both sides of the disk. Nowadays, hard disk can store up to 2 TB to 5 TB of data.

 

5.    What are the secondary storage devices used for?

The secondary storage devices are hard disk, CD, DVD, Blu-Ray and pen drives.

6.    What is Winchester Disk Drive?

The hard disk is known as Winchester disk drive. It is the main storage medium for computers.

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