james harland james harland@rmit edu au n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
COSC1078 Introduction to Information Technology Lecture 9 Data Storage Devices PowerPoint Presentation
Download Presentation
COSC1078 Introduction to Information Technology Lecture 9 Data Storage Devices

Loading in 2 Seconds...

play fullscreen
1 / 25

COSC1078 Introduction to Information Technology Lecture 9 Data Storage Devices - PowerPoint PPT Presentation


  • 110 Views
  • Uploaded on

James Harland james.harland@rmit.edu.au. COSC1078 Introduction to Information Technology Lecture 9 Data Storage Devices. Introduction. Who is this bloke?. Introduction. Overview. Questions? WebLearn Test 1 Assignment 1 Binary Representation Questions?. Introduction to IT.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'COSC1078 Introduction to Information Technology Lecture 9 Data Storage Devices' - demetrius-galloway


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
james harland james harland@rmit edu au
Intro to IT

James Harland

james.harland@rmit.edu.au

COSC1078 Introduction to Information TechnologyLecture 9Data Storage Devices
introduction
Intro to ITIntroduction

Who is this bloke?

overview
Intro to ITOverview
  • Questions?
  • WebLearn Test 1
  • Assignment 1
  • Binary Representation
  • Questions?
introduction to it
Intro to ITIntroduction to IT

1 Introduction

2Images

3Audio

4Video WebLearnTest 1

5Binary RepresentationAssignment 1

6 Data Storage

7Machine Processing

8 Operating Systems WebLearn Test 1

9 Processes Assignment 2

10 Internet

11Internet Security WebLearn Test 3

12Future of IT Assignment 3, Peer and Self Assessment

questions
Questions?

How did you spend 6-8 hours on this course last week?

This week?

Lecture 9: Video

SE Fundamentals

assessment process
Intro to ITAssessment Process
  • Submit all assignments via Blackboard in the Learning Hub
  • Assignment 1 due 11.59pm Sunday 1st April
  • Assignment 2 due 11.59pm Sunday 6th May
  • Assignment 3 due 11.59pm Sunday 27th May
  • Late assignments attract a penalty of 10% per day late, up to a maximum of 50%
assignment
Intro to ITAssignment
  • Assignment will be in three parts
  • Overall task is to produce a video
  • Groups of up to 3
  • Assessed by final video and group blog
  • Part 1: images and audio (end of week 5)
  • Part2: hardware (end of week 9)
  • Part 3: reflection, research (end of week 12)
assignment 1
Intro to ITAssignment 1
  • Use GIMP (or a similar tool) to perform some manipulations on an image
  • Use Audacity to perform some manipulations on sound
  • Use a movie making tool to produce something like (and much better than!) ‘Lord of the Controllers 1 & 2’
  • Email me your group and its name so that I can set up a blog on the Learning Hub
overview1
Overview

01010100001010101010100110100010101001101001010010100011100010101010100101111001001010…

Lecture 9: Data Storage Devices

Intro to IT

what do computers do
Intro to ITWhat do computers do?
  • Compute!
  • Input/Output
  • Processing
  • Memory
history
Intro to ITHistory
  • Babbage’s Difference Engine (1849)
  • Babbage’s Analytical Engine (1837-1871, never built)
  • Turing’s Universal Machine (1936, mathematical model)
  • Turing digital Boolean-logic multiplier (1937)
  • Colossus (1943, destroyed 1945)
  • ENIAC (1946)
  • Von Neumann architecture (c. 1945)
  • EDVAC (1949)
  • CSIRAC (1949)
overview2
Overview

“Thomas the Tank Engine”

Lecture 9: Data Storage Devices

Intro to IT

overview3
Overview

Video

Audio

Text

Thumbnails

Lecture 9: Data Storage Devices

Intro to IT

memory via flip flops
Memory via `Flip flops’

0

0

0

or

0

and

0

0

1

0

1

not

Lecture 9: Data Storage Devices

Intro to IT

memory via flip flops1
Memory via `Flip flops’

0

1

1

1

or

1

and

1

1

0

not

Lecture 9: Data Storage Devices

Intro to IT

memory via flip flops2
Memory via `Flip flops’
  • Can design other versions of flip-flops
  • Shows how circuits can be designed using AND, OR, NOT (NAND, NOR, XOR, …) in combinations (gates)
  • Hierarchy and abstraction
  • Shows how electric circuits can store values

Lecture 9: Data Storage Devices

Intro to IT

computer memory
Computer Memory

Cells of 8 bits each (one byte)

Most significant bit

Least significant bit

address

Lecture 9: Data Storage Devices

Intro to IT

random access memory ram
Random Access Memory (RAM)
  • Random access means any cell can be accessed at any time (and in any order)
  • Volatile – contents cleared when machine is switched off
  • Very fast compared to other forms of memory
  • DRAM: dynamic RAM (replenishes charges constantly)
  • SDRAM: synchronous DRAM – faster still
  • Often have small very fast caches and registers

Lecture 9: Data Storage Devices

Intro to IT

magnetic disk
Magnetic Disk
  • Thin spinning metal disk with magnetic coating
  • Each disk contains a number of circular tracks
  • Often several disks stacked on top of each other
  • Cylinders made up of tracksmade up of sectors
  • Can have very large storage this way
  • Slow access time!

Lecture 9: Data Storage Devices

Intro to IT

magnetic disk hard disk
Magnetic Disk (Hard Disk)

Seek time: move heads from one track to another

Latency time: half time for complete disk rotation

Access time: seek time + latency time

Transfer rate: rate data can be read from disk

`Typical’ Hard disk

Seek time: 2ms to 15ms

Latency time: 8ms to 20ms

Transfer rate: 0.5 GB per second

Sounds fast, but is actually quite slow …

Lecture 9: Data Storage Devices

Intro to IT

optical disks cds dvds
Optical Disks (CDs, DVDs)

Laser readers rather than magnetic ones

Disks more error-tolerant than magnetic ones

Lecture 9: Data Storage Devices

Intro to IT

flash drives
Flash Drives
  • Disks of all sorts are slow compared to other circuits
  • Flash drives ‘write’ small electronic circuits
  • Eventually decay after many changes of data
  • Suitable for slow-changing data, not main memory
  • Portable and much more resilient than disks

Lecture 9: Data Storage Devices

Intro to IT

older storage types
Older Storage Types

Magnetic tape

`Floppy’ disk

(5.25’’ disk)

3.5’’ disk

Lecture 9: Data Storage Devices

Intro to IT

conclusion
Intro to ITConclusion
  • Get Assignment done this week
  • Don’t forget to blog …
  • Keep reading! (book particularly)