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Chapter Profile
Secondary Memory
This memory is permanent in nature and is not directly accessed by the CPU. It allows users
to store data that may be easily retrieved. It is cheaper as compared to primary memory.
Secondary memory devices are also called secondary storage devices. They are divided in
three categories: Magnetic Disks, Optical Discs and Flash Drives.
Magnetic Disk
A device such as a hard disk is covered with a magnetic coating. You can record and erase
data on a magnetic disk any number of times.
Hard Disk: It consists of one or more magnetic disks called platters.
It is permanently fixed in the CPU box. It comes in a variety of sizes
with storage capacities as high as 5 TB (TeraByte) or even more.
External hard disks are also available. They are the hard disks
that can be connected to any computer with the help of a USB
port. Hard disk
Optical Disc
An optical disc is an electronic data storage medium that can be written onto and read
using a low powered laser beam.
Compact Disc (CD): The CD drive reads information
stored on a compact disc (CD). CD is an external storage
device. It can hold up to 700 MB of data. A CD is read or
written on by a CD drive which is fitted in the CPU box. Exercise
CD DVD The types of CDs are CD-ROM, CD-RW and CD-R.
Digital Versatile or Video Disc (DVD): DVDs are widely used to store data. A DVD is A. Tick ( ) the correct option.
similar to a CD. It has a storage capacity of 4.7 GB.
1. Which of the following is an example of primary memory?
Flash Drive a. Hard Disk b. CD
The Flash Drive is a small portable data storage device integrated with a USB (Universal c. RAM d. Pen Drive
Serial Bus) connector.
2. What type of memory holds data even after the computer is switched off?
Pen Drive: Pen drive is a storage device which can store a large amount of data. It is
connected to a computer using a USB port. It can be carried in your pocket easily. Pen a. RAM b. ROM
drive has storage capacity of up to 1 TB. c. Flash Drive d. None of these
Memory Card: It is commonly known as multimedia 3. A group of 4 bits is known as .
memory card. It is very small in size usually 1–1.5 a. Byte b. Nibble
inches. These are used in mobile phones and digital
cameras. You need to have card reader to read Pen drive Memory card c. Kilobyte d. Megabyte
stored data on memory card. It has a storage capacity up to 2 TB.
14 Modular (Ver. 4.0)-III

