Discovering Computers Fundamentals,

2010 EditionLiving in a Digital World

Chapter Two

Input, Output and Storage

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What Is Input?

• Input is any data and instructions entered into the memory of a computer

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What Is Input?

An input device is any hardware component that allows users to enter data

and instructions into a computer

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Keyboard and Pointing Devices

• A keyboard is an input device that contains keys users press to enter data and instructions into a computer

• A mouse is a pointing device that fits under the palm of your hand comfortably

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Touch Screens

• A touch screen is a touch-sensitive display device

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Other Types of Input

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Other Types of Input

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• A digital camera is a mobile device that allows users to take pictures and store them digitally

• A flatbed scanner creates a file of the document in memory

• A bar code reader: uses laser beams to read bar codes

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Other Types of Input

• Biometrics authenticates a person’s identity by verifying a personal characteristic

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Fingerprint reader

Face recognition

system

Hand geometry system

Voice verification

system

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Other Types of Input

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fingerprint reader

iris recognition

system

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What Is Output?

• Output is data that has been processed into a useful form

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What Is Output?

• An output device is any type of hardware component that conveys information to one or more people

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Display devices Printers

Speakers, headphones, and earbuds

Data projectors

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Display Devices

• A display device visually conveys text, graphics, and video information

• A monitor is packaged as a separate peripheral– LCD monitor (Liquid Crystal

Display)– LED monitor (Light-Emitting

Diodes )– Plasma monitors

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Printers

• A printer produces text and graphics on a physical medium

• Different types of printers– Ink-jet printer– Laser printer– Plotters are used to produce high-quality drawings

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Printers

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Other Output Devices

• Headphones are speakers that cover your head or are placed outside of the ear

• Earbuds (also called earphones) rest inside the ear canal

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Discovering Computers Fundamentals,

2010 EditionLiving in a Digital World

Part Two

Storage

Storage holds data, instructions, and information for future use

A storage medium is the physical material on which a computer keeps data, instructions, and information

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Storage

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Storage

• Capacity is the number of bytes a storage medium can hold

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Storage

• A storage device is the computer hardware that records and/or retrieves items to and from storage media

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Reading is the process of transferring items from a storage medium into memory

Writing is the process of transferring items from memory to a storage medium

Hard Disks

• A hard disk contains one or more inflexible, circular platters that use magnetic particles to store data, instructions, and information

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Hard Disks

• The hard disk arms move the read/write head, which reads items and writes items in the drive

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Flash Memory Storage

• Flash memory chips are a type of solid state media and contain no moving parts

• Solid state drives (SSDs) have several advantages over magnetic hard disks:

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Faster access time

Faster transfer rates

Generate less heat and consume less

powerLast longer

Flash Memory Storage

• A memory card is a removable flash memory device that you insert and remove from a slot in a computer, mobile device, or card reader/writer

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Flash Memory Storage

• USB flash drives plug into a USB port on a computer or mobile device

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Optical Discs

A CD-ROM can be read from but not written to•Read from a CD-ROM drive or CD-ROM player

A CD-R is a multisession optical disc on which users can write, but not erase

A CD-RW is an erasable multisession disc•Must have a CD-RW drive

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Optical Discs

A DVD-ROM is a high-capacity optical disc on which users can read but not write or erase•Requires a DVD-ROM drive

A Blu-ray Disc-ROM (BD-ROM) has a storage capacity of 100 GB

DVD-RW, DVD+RW, and DVD+RAM are high-capacity rewritable DVD formats

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Other Types of Storage

• Enterprise storage stores huge volumes of data and information for large businesses– Uses special hardware for heavy use, maximum

availability, and maximum efficiency

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