discovering computers fundamentals, 2010 edition living in a digital world chapter two input,...
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3 What Is Input? An input device is any hardware component that allows users to enter data and instructions into a computer 3TRANSCRIPT
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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