Categories: Lesson Notes

Primary Three Third Term Computer (ICT) Lesson Note

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WEEK 2&3

Topic: Components of the computer system unit 1&11

Subtitle: Disk Drive

Learning Objectives: At the end of this lesson, pupils should be able to:

Say the meaning of disk drive
Identify the different types of disk drive
Locate the position of floppy disk drive in the computer
State the meaning of CD and ROM

Resources and materials:

Scheme of work
Online information
Instructional material:
Textbook
Chalkboard
Pictures/charts of disk drive and the types of disk drive

Building Background/connection to prior knowledge: pupils are familiar with the topic in their previous classes.

CONTENT

MEANING OF DISK DRIVE

A drive is a location (medium) that is capable of storing and reading information that is not easily removed, like a disk or disc

A disk drive is a device that reads and/or writes data to a disk. The most common type of disk drive is a hard drive (or “hard disk drive”), but several other types of disk drives exist as well. Some examples include removable storage devices, floppy drives, and optical drives, which read optical media, such as CDs and DVDs.

Types of disk drive

There are different types of disk drive

HARD DRIVES

These are also called ‘fixed disks’ in ancient computers because the storage media is mounted within the computer and not intended to be removed.

FLOPPY DRIVES

Named for the media disks that could be pulled out and that would ‘flop’ when carried. These disks are designed to allow users to store data to a disk, remove it and carry the data elsewhere. These typically come in one of two formats in the United States: 3.5″ @1.44Mbytes and 5.25″ at 1.22 Mbytes. There are a few proprietary types as well, such as Zip drives, DAT tapes etc.

CD-ROM

Compact Disk Read Only Memory or CD-ROMs are shiny circular pieces of plastic with a hole in the middle. These look like audio compact disks and computer software and data are stored on them. They are read using a powerful (red) light-emitting diode (LED) that is sometimes called a ‘laser’ and thus the name ‘laser disk’. Compact Disk media is made of pressed layers of plastic and can store about 640 MB of data.

DVD-ROM

Digital Video Disks were first used to store movies for playback on compact players.

Blu-Ray

The latest development in data storage and movie disks is Blu-Ray, so called because it uses a blue LED (sometimes called a laser, which is actually something entirely different) to read/write from the disk.

REMOVEABLE DRIVES

These are drives where the drive itself can be removed or ported elsewhere. The media is usually not pulled out. Removable hard drives are a good example of these.

Position of the floppy disk in the computer

A floppy disk, like a cassette tape, is made from a thin piece of plastic coated with a magnetic material on both sides. However, it is shaped like a disk rather than a long thin ribbon. The tracks are arranged in concentric rings so that the software can jump from “file 1” to “file 19” without having to fast forward through files 2-18. The diskette spins like a record and the heads move to the correct track, providing what is known as direct access storage

Meaning of CD AND ROM

Stands for “Compact Disc Read-Only Memory.” A CD-ROM is a CD that can be read by a computer with an optical drive. The “ROM” part of the term means the data on the disc is “read-only,” or cannot be altered or erased. Because of this feature and their large capacity, CD-ROMs are a great media format for retail software.

Strategies& Activities: