Computers Are Your Futureweek2).pdf"Fluorescent multilayer disc-read-only memory "Each layer of the...
Transcript of Computers Are Your Futureweek2).pdf"Fluorescent multilayer disc-read-only memory "Each layer of the...
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Computers Are Your Future
© 2006 Prentice-Hall, Inc.
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Computers Are Your Future Chapter 7
© 2006 Prentice-Hall, Inc Slide 2
Computers Are Your Future
Chapter 7
Input/Output and Storage
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Computers Are Your Future Chapter 7
© 2006 Prentice-Hall, Inc Slide 3
What You Will Learn About
ü The purpose of special keys and the most frequently used pointing devices
ü The characteristics of a monitor’s quality and the various types of monitors
ü The two major types of printers ü The difference between memory and storage
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Computers Are Your Future Chapter 7
© 2006 Prentice-Hall, Inc Slide 4
What You Will Learn About
ü The categories of storage devices ü The performance characteristics of hard drives ü How data is stored on both hard and floppy disks ü The various optical storage media available for
personal computers
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Computers Are Your Future Chapter 7
© 2006 Prentice-Hall, Inc Slide 5
Input
ü Input is any data entered into the computer’s memory
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Computers Are Your Future Chapter 7
© 2006 Prentice-Hall, Inc Slide 6
Input Devices: Giving Commands
Keyboard
Mouse
Other Pointing Devices
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Computers Are Your Future Chapter 7
© 2006 Prentice-Hall, Inc Slide 7
Keyboard
ü The keyboard allows the computer user to enter words, numbers, punctuation, symbols, and special function commands into the computer’s memory
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Computers Are Your Future Chapter 7
© 2006 Prentice-Hall, Inc Slide 8
Enhanced / Extended Keyboard
Ergonomic Keyboard
Types of Keyboards
ü Enhanced or Extended keyboard – Typically 101 keys laid out in the QWERTY fashion; connected to the computer by a cable
ü Cordless keyboard – Uses infrared or radio wave signals ü Ergonomic keyboard – Designed to help prevent cumulative
trauma disorder (CTD) or damage to nerve tissues in the wrist and hand due to repeated motion
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Computers Are Your Future Chapter 7
© 2006 Prentice-Hall, Inc Slide 9
The Mouse
ü The mouse is the most widely used pointing device
ü A mouse is palm sized
ü As the mouse is moved, its movements are mirrored by the on-screen pointer
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Computers Are Your Future Chapter 7
© 2006 Prentice-Hall, Inc Slide 10
Wheel Mouse
Cordless Mouse
Types of Mice
ü Wheel mouse – Contains a rotating wheel used to scroll vertically within a text document; connects to PS/2 port or USB port
ü Cordless mouse – Uses infrared signals to connect to the computer’s IrDA port; it must be within sight of the receiving port
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Computers Are Your Future Chapter 7
© 2006 Prentice-Hall, Inc Slide 11
Joystick
Touch Pad
Touch Screen Trackball
Pointing Stick
Pen
Other Types of Pointing Devices
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Computers Are Your Future Chapter 7
© 2006 Prentice-Hall, Inc Slide 12
Using the Mouse
ü Mouse buttons enable the user to initiate actions
Ø Clicking (left-, right-, or double-clicking) allows the user to select an item on the screen or open a program or dialog box
Ø Click and drag – Holding down the left mouse button and moving the mouse enables the user to move objects on the screen
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Computers Are Your Future Chapter 7
© 2006 Prentice-Hall, Inc Slide 13
Audio Input: Speech Recognition
ü Speech recognition is a type of input in which the computer recognizes words spoken into a microphone
ü Special software and a microphone are required
ü Latest technology uses continuous speech recognition where the user does not have to pause between words
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Computers Are Your Future Chapter 7
© 2006 Prentice-Hall, Inc Slide 14
Scanners Flatbed
Fax Machines
Alternative Input Devices
Barcode reader
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Computers Are Your Future Chapter 7
© 2006 Prentice-Hall, Inc Slide 15
Monitors
ü A monitor is a peripheral device which displays computer output on a screen
ü Screen output is referred to as soft copy ü Types of monitors:
Ø Cathode-ray tube (CRT) Ø Liquid Crystal Display (LCD or flat-panel)
CRT LCD
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Computers Are Your Future Chapter 7
© 2006 Prentice-Hall, Inc Slide 16
Cathode-ray tube (CRT)
ü Resemble televisions ü Use picture tube technology ü Less expensive than a LCD
monitor ü Take up more desk space and
use more energy than LCD monitors
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Computers Are Your Future Chapter 7
© 2006 Prentice-Hall, Inc Slide 17
Liquid Crystal Display (LCD) ü Cells sandwiched between two transparent layers form images ü Used for notebook computers, PDAs, cellular phones, and
personal computers ü More expensive than a CRT monitor ü Take up less desk space and use less energy than CRT
monitors ü Types of LCD monitors:
Ø Passive-matrix LCD Ø Active-matrix LCD Ø Gas plasma display Ø Field emission display
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Computers Are Your Future Chapter 7
© 2006 Prentice-Hall, Inc Slide 18
Monitor Specifications
ü Screen size – The diagonal measurement of the screen surface in inches (15, 17, 19, 21)
ü Resolution – The sharpness of the image determined by the number of horizontal and vertical dots (pixels) that the screen can display (800 x 600, 1024 x 768, 1600 x 1200)
ü Refresh rate – The speed at which the screen is redrawn (refreshed) and measured in Hertz (Hz) (60Hz, 75Hz)
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Computers Are Your Future Chapter 7
© 2006 Prentice-Hall, Inc Slide 19
Printers
ü A printer is a peripheral device that produces a physical copy or hard copy of the computer’s output
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Computers Are Your Future Chapter 7
© 2006 Prentice-Hall, Inc Slide 20
Inkjet Laser
Types of Printers
ü Inkjet printer, also called a bubble-jet, makes characters by inserting dots of ink onto paper
ü Letter-quality printouts ü Cost of printer is inexpensive
but ink is costly
ü Laser printer works like a copier
ü Quality determined by dots per inch (dpi) produced
ü Color printers available ü Expensive initial costs but
cheaper to operate per page
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Computers Are Your Future Chapter 7
© 2006 Prentice-Hall, Inc Slide 21
Plotter
ü A plotter is a printer that uses a pen that moves over a large revolving sheet of paper
ü It is used in engineering, drafting, map making, and seismology
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Computers Are Your Future Chapter 7
© 2006 Prentice-Hall, Inc Slide 22
Hard Drive – storage RAM – memory
Memory vs. Storage
ü Storage, also known as mass media or auxiliary storage, refers to the various media on which a computer system can store data
ü Storage devices hold programs and data in units called files
ü Memory is a temporary workplace where the computer transfers the contents of a file while it is being used
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Computers Are Your Future Chapter 7
© 2006 Prentice-Hall, Inc Slide 23
Why Is Storage Necessary?
ü Storage devices: Ø Retain data when the computer is turned off
Ø Are cheaper than memory
Ø Play an important role during startup
Ø Are needed for output
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Computers Are Your Future Chapter 7
© 2006 Prentice-Hall, Inc Slide 24
Platter Read/Write head
Hard Disks
ü Hard disks are high-speed, high-capacity storage devices
ü They contain metal disks called platters
ü They contain two or more stacked platters with read/write heads for each side
ü Hard disks can be divided into partitions to enable computers to work with more than one operating system
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Computers Are Your Future Chapter 7
© 2006 Prentice-Hall, Inc Slide 25
More Hard Drives
ü Removable Hard Disks Ø Platter is enclosed in a cartridge
Ø Can be inserted into a drive bay
Ø Secondary storage – storage that isn’t directly available
ü Internet Hard Drives Ø Storage space on a server
Ø Subscription service
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Computers Are Your Future Chapter 7
© 2006 Prentice-Hall, Inc Slide 26
Factors Affecting a Hard Disk’s Performance
ü Seek time or positioning performance – How quickly the read/write head positions itself and begins transferring information. It is measured in milliseconds (ms)
ü Spindle speed or transfer performance – How quickly the drive transfers data. It is measured in rotations per minute (RPM)
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Computers Are Your Future Chapter 7
© 2006 Prentice-Hall, Inc Slide 27
Floppy and Zip Disks and Drives
ü A disk or diskette is a portable storage medium ü High-density floppy disks that are commonly
used today store 1.44 MB of data ü Disks work with a disk drive ü Zip disks store up to 750 MB of data and are not
downwardly compatible with floppy disks
Zip Drive Floppy Drive
Floppy Disk
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Computers Are Your Future Chapter 7
© 2006 Prentice-Hall, Inc Slide 28
Protecting the Data on Your Disks
ü Don’t touch the surface of the disk ü Don’t expose disk to magnetic fields ü Avoid contamination (food, drink) ü Avoid condensation ü Avoid excessive temperatures
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Computers Are Your Future Chapter 7
© 2006 Prentice-Hall, Inc Slide 29
CD-ROM Discs and Drives
ü CD-ROM stands for Compact Disc-Read Only Memory
ü CD-ROM drives can not write data to discs
ü They are capable of storing 650 MB of data
ü They are used for storing operating systems, large application programs, and multimedia programs
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Computers Are Your Future Chapter 7
© 2006 Prentice-Hall, Inc Slide 30
CD-R and CD-RW Discs and Recorders
CD-R ü Discs can be read and
written to ü Discs can only be
written to “once” ü CD-R drives are capable
of reading and writing data
CD-RW ü Discs can be read and
written to ü Discs are erasable ü Discs can be written to
many times ü CD-RW drives are
capable of reading, writing, and erasing data
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Computers Are Your Future Chapter 7
© 2006 Prentice-Hall, Inc Slide 31
DVD-ROM Discs and Drives
ü DVD stands for Digital Video Disc
ü DVD technology is similar to CD-ROM technology
ü DVDs are capable of storing up to 17GB of data
ü The data transfer rate of DVD drives is comparable to that of hard disk drives
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Computers Are Your Future Chapter 7
© 2006 Prentice-Hall, Inc Slide 32
DVD-RW and DVD+RW Discs
DVD-R and DVD+R drives have the ability to read/write data
DVD-RW and DVD+RW drives allow you to write, erase, and read from a disc many times
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Computers Are Your Future Chapter 7
© 2006 Prentice-Hall, Inc Slide 33
Protecting Data on Discs
ü Do not expose discs to excessive heat ü Do not touch underside of discs ü Do not write on the label side of discs with a
hard instrument ü Do not stack discs ü Store discs in original
boxes
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Computers Are Your Future Chapter 7
© 2006 Prentice-Hall, Inc Slide 34
The Future of Storage
ü FMD-ROM Ø Fluorescent multilayer disc-read-only memory Ø Each layer of the disc contains data Ø Layer is transparent enough for light to shine through Ø Laser can focus on one layer at a time Ø Allows for additional storage capability
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Computers Are Your Future Chapter 7
© 2006 Prentice-Hall, Inc Slide 35
Solid State Storage Devices
ü Solid state storage devices use nonvolatile memory chips to retain data
ü They do not have moving parts
ü They are small, lightweight, reliable, and portable
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Computers Are Your Future Chapter 7
© 2006 Prentice-Hall, Inc Slide 36
Compact Flash Memory
Flash Memory
Smart Card
Micro Drive
Memory Stick
PC Card
Solid State Storage Devices
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Computers Are Your Future Chapter 7
© 2006 Prentice-Hall, Inc Slide 37
Chapter 7 Summary
• Input is the software, data, and information that is entered into the computer’s memory
• Input devices such as the keyboard, mouse, and trackball enable the user to enter data
• A pointing device enables the user to control movements of an on-screen pointer
• Speech recognition software enables the user to enter data into a computer by speaking into a microphone
• Monitors enable the user to view the computer’s processed data; the output is known as soft copy
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Computers Are Your Future Chapter 7
© 2006 Prentice-Hall, Inc Slide 38
Chapter 7 Summary (continued)
• The two types of monitors are the CRT and the LCD • A monitor’s quality is measured by screen size, resolution, and
refresh rate • Printers produce permanent versions (hard copies) of the
computer’s output • The two basic types of printers are the inkjet and laser • Memory makes software and data available for the CPU’s use • Storage devices are categorized by:
Read-only Read/write Random access Near online (secondary)
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Computers Are Your Future Chapter 7
© 2006 Prentice-Hall, Inc Slide 39
Chapter 7 Summary (continued)
• A hard disk’s performance is measured by its positioning performance and transfer rate
• Optical storage devices include: CD-ROM– Read-only CD-R– Record once CD-RW– Erasable, write repeatedly DVD-ROM/DVD+ROM – Read-only DVD-R/DVD+R– Read/write DVD-RW/DVD+RW – rewritten many times
• Solid state storage devices include: PC cards Flash memory cards Smart cards