© Paradigm Publishing Inc. 3-1 Chapter 3 Output and Storage.

Chapter 3Output and Storage

Presentation Overview

• Output• Display Devices• Printers• Audio Output• Storage Devices and Media• Magnetic Storage Devices and Media• Optical Storage Devices• Large Computer System Storage Devices

Output

Types of Output

Output

Types of Output– Text – characters and numbers used to create words, sentences, and paragraphs

Output

Types of Output– Text – characters and numbers used to

create words, sentences, and paragraphs– Audio – any sound, including speech and music

Output

Types of Output– Text – characters and numbers used to

create words, sentences, and paragraphs– Audio – any sound, including speech and music– Video – motion images, similar to those seen on a television or movie screen

Output

Output Devices and Media

Output

Output Devices and Media– Output device – any hardware device that makes information available to a user

– monitors, printers, plotters

Output

Output Devices and Media– Output device – any hardware device that makes information available to a user

– monitors, printers, plotters

– Output medium – any medium on which information is recorded– paper, plastic film, magnetic tape

Display Devices

Monitor– most common

soft-copy output device

– consists of a viewing screen and electronic parts that show information on a screen

Display Devices

Monitor Resolution– Number of pixels

determines quality.– A pixel is a single dot

of anything displayed on a screen.

– More pixels cause higher resolution and more detailed images.

Display Devices

Monitor PerformanceDetermined by– Video card – more

VRAM means truer color and faster speed

– Resolution – more pixels mean sharper graphics

– Refresh rate – faster rate means less screen flicker

Display

DevicesMonitor ErgonomicsCorrect positioning when using a monitor can reduce physical fatigue and discomfort.

Display Devices

Other display devices

Display Devices

Other display devices– Wearable computers – devices such as

headsets, eyeglasses, watches, etc., free workers from working in front of a computer

Display Devices

– Television displays – HDTV provides a wider screen and higher resolution

Display Devices

– Television displays – HDTV provides a wider screen and higher resolution

– Screen projector – projects images on a screen to large audiences

Printers

What types of printers are available?

Printers

– Impact printers• dot-matrix and line printers

Printers

– Nonimpact printers

• ink-jet printers, laser printers, thermal printers, and plotters

Printers

– Nonimpact printers• ink-jet printers, laser printers, thermal printers, and plotters

– Special-purpose nonimpact printers• postage printers, laser printers, and photo printers

Printers

– Nonimpact printers• ink-jet printers, laser printers, thermal printers, and plotters

– Special-purpose nonimpact printers• postage printers, laser printers, and photo printers

– Multifunction device• facsimile machine

Printers

Portrait format’s (at left) name comes from the fact that traditional portraits are taller than they are wide. To illustrate a landscape (above), wider images are usually more useful.

Printers

Before striking the ribbon, the dot matrix printer extends the correct combination of pins to form a specific character.

As with the display of pixels on a monitor, the more pins the printer uses, the sharper the printed letters.

Printers

An ink jet printer produces output by spraying tiny ink droplets onto the paper or other medium to form text and images.

Printers

A laser printer produces output in a manner similar to that of a copy machine.

Printers

Other printers

Printers

Other printers

– Thermal printers – use heat to transfer an impression onto paper

Printers

Other printers

– Plotters – produce large-sized high-quality documents

Printers

Other printers

– Photo printers – high-quality ink-jet printers print photos

Printers

Other printers

– Photo printers – high-quality ink-jet printers print photos

– Label printers – use heat to print on adhesive material

Printers

Other printers

Printers

Other printers– Postage printers – weigh items, print postage,

and meter postage account

Printers

and meter postage account– Portable printers – battery powered, small, light-

weight

Printers

and meter postage account– Portable printers – battery powered, small, light-

weight– Facsimile machines – can send and receive

copies of documents through telephone lines

Audio Output

– Built-in speakers produce warning sounds.

Audio Output

– Built-in speakers produce warning sounds.– Sound cards produce high-quality sound through

external speakers for many applications using music, voice, etc.

Audio Output

– Speaker headsets position miniature speakers over the ears to minimize sound distraction.

Audio Output

– Speaker headsets position miniature speakers over the ears to minimize sound distraction.

– Voice output produces synthesized human speech.

Storage Devices and Media

Examples of commonly used file extensions

More examples of commonly used file extensions

• A storage device is hardware that houses a storage medium on which data is recorded.

• Magnetic devices– floppy disk

– hard disk

– tape cartridge

– USB flash drive

• Magnetic devices • Optical devices– floppy disk – compact disc (CD)

– hard disk – digital versatile

– tape cartridge disc (DVD)

– USB flash drive

Magnetic Storage Devices and Media

Floppy Disk– a thin, circular

Mylar® wafer sandwiched between two sheets of special cleaning tissue inside a plastic case

– stores data along the tracks and sectors on the floppy disk

Floppy disk handling and storage guidelines

The process of formatting a floppy disk results in the disk being arranged into tracks and sectors. Data is stored in sectors along the tracks.

A hard drive contains one or more hard disks on which data is stored. When activated, read/write heads move in and out between the disks to record and/or read data.

USB Flash Drive

– a magnetic storage device that plugs into a USB port of a computer

– about the size of a car key, can store up to several gigabytes of data

Tape Cartridges and Tape Drives

– magnetically coated tape in a small plastic housing

– used mainly for backing up the contents of a hard drive

Optical Storage Devices

The CD is loaded printed side up, and the holes in the tray allow the laser to read the bottom surface of the disc once the tray is closed.

How do optical devices store data?

– High-intensity laser records data by burning indentions (pits) onto disc surface.

– Flat, unburned areas on disc are called lands.

– Flat, unburned areas on disc are called lands.– Two low-intensity lasers read and write each bit

as a digit 0 and each land as a digit 1.

An optical disc drive reads binary data stored on an optical disc.

Information is stored on a series of sectors along a single track that spirals outward from the center to the outer edge of the optical disc.

Optical Storage DevicesTypes and storage capacities of optical discs

(CD-R) Compact Disc, Recordable– allows PC to record (burn)

information on a CD-R disc

– writes once to disc, and resulting CD can be read in a standard CD-ROM drive

– can hold 650-700 MB of information

(CD-RW) Compact Disc, Rewritable

– can be erased and rewritten multiple times

– can be erased and rewritten multiple times– CD-RW drive and special software required

– can be erased and rewritten multiple times– CD-RW drive and special software required– can hold 650-700 MB of information

DVD-R Discs (Digital Versatile Disc, Recordable)

– can be recorded on only one time

– can be read by most commercial DVD-ROM players

– can hold up to 4.7 GB of data

– new format called Blu-ray can store 27 GB of data

DVD-RW Discs (Digital Versatile Disc, Rewritable)

– allows data to be erased and recorded over many times without damaging disc

– can store up to 4.7 GB of data

– can store up to 4.7 GB of data– can be read by most commercial CD-ROM players

Care instructions for optical discs

Steps for cleaning an optical disc

Large Computer System Storage Devices

Magnetic Disk Storage

– Disk drive houses many hard disks in a plastic container.

– Read/write heads record information and store data by moving among disks.

Magnetic Tape Storage

– removable reels of magnetic tape

– data is stored and accessed sequentially along full length of tape

– used primarily for backup and storage of data

WORM (write once, read many) disk

– used for very high capacity storage

– used for very high capacity storage– mainly found in mainframe applications

– used for very high capacity storage– mainly found in mainframe applications– ideal for storing archival-type material

– used for very high capacity storage– mainly found in mainframe applications– ideal for storing archival-type material– usually readable only on drive on which data were

written

On the Horizon

Based on the information presented in this chapter and your own experience, what do you think is on the horizon?

© Paradigm Publishing Inc. 3-1 Chapter 3 Output and Storage.

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