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Computer Systems
Computer Systems
Lesson Aims
Lesson Aims
Input Devices
Input Devices
Output Devices
Output Devices
Input/output Devices
Input/output Devices
Backing Storage
Backing Storage
Storage Terms
Storage Terms
Types Of Access
Types Of Access
Backing Storage
Backing Storage
Floppy Disks
Floppy Disks
Hard Disk Drives (HDD’s)
Hard Disk Drives (HDD’s)
Magnetic Tape
Magnetic Tape
Optical Storage – CD/DVD
Optical Storage – CD/DVD
USB Flash Drives
USB Flash Drives
Summary
Summary

Презентация на тему: «Computer Systems». Автор: . Файл: «Computer Systems.ppt». Размер zip-архива: 1418 КБ.

Computer Systems

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1 Computer Systems

Computer Systems

Nat 4/5 Computing Science Input, Output and Backing Storage

2 Lesson Aims

Lesson Aims

By the end of this lesson: Pupils will be able to: Describe the features, functions and uses of: keyboard, mouse, microphone, touchpad, digital camera, scanner, webcam Describe the features, functions and uses of monitor, LCD panel, inkjet and laser printers, loudspeakers Compare devices using appropriate characteristics including resolution, capacity, speed of data transfer, cost

3 Input Devices

Input Devices

An input device is a device which creates some new information to put INTO the system

Nat 4/5

4 Output Devices

Output Devices

An output device is a device which gets information FROM the system

Nat 4/5

5 Input/output Devices

Input/output Devices

You have to be able to compare these devices in terms of appropriate characteristics such as: Resolution Capacity Speed of data transfer Cost

Nat 4/5

6 Backing Storage

Backing Storage

7 Storage Terms

Storage Terms

BIGGER ->

BIGGER ->

BIGGER ->

BIGGER ->

BIGGER ->

BIGGER ->

Nat 4/5

Term

Abbreviation

Description

Bit

binary digit, 0 or 1

Byte

a group of 8 bits – Single Letter

Kilobyte

Kb

1024 bytes

Megabyte

Mb

1024 Kilobytes

Gigabyte

Gb

1024 Megabytes

Terabyte

Tb

1024 Gigabytes

8 Types Of Access

Types Of Access

Sequential Access

Direct/Random Access

To go from file A to file Z in a sequential-access system, you must pass through all files in order. Sequential access is sometimes called serial access

Refers to the ability to access data at random. In a random-access system, you can jump directly to file Z. Disks are random access media, whereas tapes are sequential access media

Nat 4/5

9 Backing Storage

Backing Storage

Backing storage is used to save permanent copies of your files onto. There are 3 main types Magnetic These use magnetic fields to store the data Floppy Disks/Hard Disk Drives Magnetic Tapes Optical These store data by means of lasers ‘burning’ a disk CDROM/DVD/Blue Ray Solid State This uses no moving parts at all, uses memory chips USB Drives SSD Hard Drives

Nat 4/5

10 Floppy Disks

Floppy Disks

Floppy Discs are small pieces of plastic film wrapped in a plastic case, they are fast becoming very scarce due to their slow transfer speed and limited capacity, have basically been replaced with USB Flash Drives

Nat 4/5

Type Of Access

Direct/Random

Capacity

1.44 Megabytes

Portability

Very – Only requires another drive

Transfer Rate

Very Slow – 500Kbps

Price

Approx 25p per Disk

11 Hard Disk Drives (HDD’s)

Hard Disk Drives (HDD’s)

Hard Disk Drives are usually stored inside the computer. They use disks of metal which are magnetically charged. These are read by a small head – like a record player, which moves over the disks.

Nat 4/5

Type Of Access

Direct/Random

Capacity

Up to 3TB

Portability

Not portable

Transfer Rate

Up to 600Mbps

Price

Approx ?40 - ?220

12 Magnetic Tape

Magnetic Tape

Magnetic tapes are essentially the same as music tapes. To access a file you have to sequentially go through every file by fast forwarding or rewinding. They are however relatively cheap and easy to store. Often used for backups

Nat 4/5

Type Of Access

Sequential

Capacity

Up to 80GB

Portability

Very portable, requires another drive

Transfer Rate

Up to 7Mbps

Price

Up to ?20 per tape

13 Optical Storage – CD/DVD

Optical Storage – CD/DVD

CD and DVD’s are optical media – a laser is used to burn holes (pits) into the surface of the disk. CD/DVD-R are recordable once CD/DVD-RW are rewritable more than once

Nat 4/5

Type Of Access

Direct/Random

Capacity

CD: 700MB (80 minutes audio) DVD 4.7GB up to 50GB Blue Ray

Portability

Very portable, requires another drive

Transfer Rate

Approx 130Mbps

Price

CDR: 20-30p DVDR: 30p-?1

14 USB Flash Drives

USB Flash Drives

USB (Universal Serial Bus) flash drives use memory chips to store data, this means there are no moving parts at all – this is called solid state storage, this means they are very robust. These are often used in MP3 – Players – Ipod Nano/Shuffle uses this. Some are even waterproof or branded with company logos

Nat 4/5

Type Of Access

Direct/Random

Capacity

Up to 128GB

Portability

Very portable, only requires USB port

Transfer Rate

10-30MBps

Price

?10-?100+

15 Summary

Summary

There are three main types of backing storage Optical Magnetic Solid State There are two main types of access Sequential Direct/Random Input Devices put information INTO the computer Output Devices get information FROM the computer

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