Tech level cyber security 2n, 2o, 2p

Learning objectives Learners will have the opportunity to: recognise a range of input devices (eg mouse, scanner, keyboard, touch screen, web cam, microphone, barcode reader, sensors) evaluate a range of input devices to identify the most appropriate for a given scenario identify a range of biometric devices evaluate a range of biometric devices and select the most appropriate for a given scenario identify a range of external output components (eg printers (2D, 3D), screens, speakers, slide projectors) evaluate the suitability of secondary/backing storage eg hard disc drives, USB drives, Read/writeable DVDs, removable magnetic discs, fixed magnetic discs, solid state drives (SSD)

Assessment outcomes 2n – Input devices e.g. mouse, scanner, keyboard, touch screen, webcam, microphone, barcode reader, sensors, biometric readers (e.g. fingerprint, iris) 2o – External output devices e.g. printers (2D/3D), screens, speakers, slide projectors 2p – Secondary/backing storage e.g. hard disc drives, USB drives, Read/Writeable DVDs, Removable Magnetic discs, Fixed magnetic disks, Solid State Drives

Pre-reading discussion Input Devices Output Devices Biometric Devices Secondary Storage

Input Devices For a computer to do useful things, we need to get data into it. We use input devices to do this. Input devices are often divided into two categories, manual input devices and automatic input devices.

Manual input devices Manual Input Devices require the user to interact with the device to input the correct data. The device does not collect the data on it’s own. Keyboards Touch Screens Graphic Tablets Mouse Webcams Microphones Scanners Cameras

Automatic input devices Automatic data input methods are methods where data is collected and processed and prepared beforehand in some way so that it can be directly entered into a computer system when needed. OMR – Optical Mark Readers Barcode Scanners Magnetic Strips (Debit/Credit Cards)

Biometric input devices Biometric verification is any means by which a person can be uniquely identified by evaluating one or more distinguishing biological traits. Unique identifiers include fingerprints, hand geometry, earlobe geometry, retina and iris patterns, voice waves, DNA, and signatures. Finger print and retinal identification are being used in many places now and even facial recognition systems are starting to be introduced. Specialised scanning devices are needed to capture the biometric data which is then passed onto the computer for processing and identification. A common use of biometric data is in the modern UK passport. A microchip is included in the passport that contains the electronic data unique to the person. At passport control, a biometric reader is used to confirm identity. Biometric authentification methods can be used to identify you at ATMs to withdraw cash, in computer networks to allow you to log on and many schools are now introducing 'fingerprint registration'! Retina Scanners Fingerprint Scanners DNA Scanners

Output Devices An output device is a piece of hardware that is used to display or output data which has been processed or has been stored on the computer. There are many different kinds of output devices. You don't need to know a great deal about any particular one but you do need to be able to make suggestions as to the most appropriate output device to use in a given scenario. You also need to be able to explain why your choice is the right one and compare it to other output devices that you could have chosen.

Output Devices Examples Task - 5 Minutes Monitors Projectors Touch Screens Printers (2D / 3D) Speakers Slide Projectors Grab an example of each of these, make sure you write down WHAT THEY ARE USED FOR.

Secondary Storage: Units of storage Bit Byte Nibble Kilobyte Megabyte Gigabyte Terabyte X 1024 X 1024 X 1024 X 1024 X 1024 X 1024

Secondary Storage: Common Types Solid state devices (Flash devices) Solid state devices have no moving parts. That means they can't get worn out and are not quite as easily damaged by bangs and knocks as optical and magnetic devices. They store store data in binary patterns using billions of tiny switches. Another point to note about solid state devices is that they need very little power to work and can get the power that they do need from the device that they are plugged into. Examples include, SD cards, micro SD cards and pen drives. Many computers and laptops are now being sold with solid state hard drives. Although typically much smaller (and cheaper) than magnetic hard drives, they are so much faster! A solid state hard drive can breathe new life into an old laptop. Optical devices Optical devices store binary patterns using lasers. The lasers shine onto a disk and change whether an area on it can reflect light or not. The laser can then be used to read back patterns by shining a laser on the disk and looking at which areas reflect light and which don't. Some types of disk can be written to just once, although you can read from them many times. These are known as 'WORM' storage devices (Write Once Read Many). CD-ROMs, DVDs and Blu-ray disks are examples of WORM disks. They are often used by manufacturers to distribute software. Other media, such as CD R/W can be written to many times as well as read many times.

Secondary Storage: Common Types Magnetic devices These store binary data patterns as billions of magnetised areas on a disk. These areas can be read from or written to by a special head that moves over the magnetic area. With hard disk drives and floppy disk drives, the disk spins very quickly (thousands of times a second) whilst the head moves over the magnestised areas, reading from and writing data to the disk. One of the things to look out for if you ever have to buy a new hard drive is how fast the disk or disks spin (hard disks often have more than one disk inside them) - the faster they spin, the quick reading and writing data can take place so the faster your computer can work. Task – 5 Minutes Find a picture and write a definition for the followowing: Solid State Hard Drive Optical Drive DVD, CD, DVD Magnetic Disc (Removable) Magnetic Disc (Fixed) Answer this: What is the difference between a removable and a fixed magnetic disc?

Task: Secondary Storage Comparisons 5 minutes What type of secondary storage would you recommend for the following scenarios, explain why. A school backing up student files daily. Limited budget 1000 students 1gb per student (Max) A portable music player Storing files on a desktop computer Storing files on a server (fixed in place)

Crib sheets Using your notes, lesson resources, and the above slides create Crib sheets that you can use to revise the following topics: 2n – Input devices e.g. mouse, scanner, keyboard, touch screen, webcam, microphone, barcode reader, sensors, biometric readers (e.g. fingerprint, iris) 2o – External output devices e.g. printers (2D/3D), screens, speakers, slide projectors 2p – Secondary/backing storage e.g. hard disc drives, USB drives, Read/Writeable DVDs, Removable Magnetic discs, Fixed magnetic disks, Solid State Drives

Graded Exercises Complete the graded exercises for today’s lesson. (Lesson 6 Folder) If you have answered a question in your notes circle the section and write the question above it in a different coloured pen.

Pre-Reading for Lesson 6 Topics Resources Specialist Operator Consoles / Terminals Computer System Libraries Utility Programs See the Lesson 7 Folder.