CGS 2060 Lecture 6: CGS 6

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13 Feb 2017
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Pointing stick
A pressure sensitive pointing device shaped like a pencil eraser that is positioned
between keys on a mobile computer keyboard
Graphics tablet (digitizer)
an electronic plastic board that detects and converts movement of a style or digital pen
into signals that are sent to the computer
Motion input (gesture recognition)
users can guide on-screen elements using air gestures
Scanner
a light-sensing input device that reads printed text and graphics and then translates the
results into a form the computer can process
Optical reader
a device that uses a light source to read characters, marks, and codes and then
converts them into digital data that a computer can process
QR code
stores information in both a vertical and horizontal direction
Radio Frequency Identification(RFID)
uses radio signals to communicate with a tag placed in or attached to an object
Magstripe readers
read the magnetic stripe on the back of cards such as bank, credit, identification cards
HDTV
the most advanced form of digital television
Non-impact printer
forms characters and graphics on a piece of paper without contacting the paper
Ink-jet printer
forms characters and graphics by spraying tiny drops of liquid ink onto a piece of paper
Thermal printer
generates images by pushing electrically heated pins against the heat-sensitive paper
Plotters
used to produce high quality drawings
Impact printers
form characters and graphics on a piece of paper by striking a mechanism against an
inked ribbon that contacts the paper
Reading
the process of transferring items from a storage medium into memory
Writing
the process of transferring items from memory to a storage medium
Capacity
the number of bytes a storage medium can hold
Access time
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the amount of time it takes a storage device to locate an item on a storage medium and
the time required to deliver an item from memory to the processor
Hard disk
contains one or more inflexible, circular platters that use magnetic particles to store
data, instructions, and information
Formatting
the process of dividing the disk into tracks and sectors
Head crash
occurs when a read/write head touches the surface of a platter
Redundant array of independent disks (RAID)
a group of two or more integrated hard disks
External hard disk
a separate freestanding storage device that connects with a cable to a port
SSD(Solid State Drive)
has higher storage capacity and faster access times than magnetic hard disks
Cloud storage
an internet service that provides storage to computer or mobile device users
Optical disc
a flat, round, portable disc made of metal, plastic, and lacquer that is written and read
by a laser
CD-ROM
can be read from but not written on
CD-R
an optical disc on which users can write once, but not erase
CD-RW
an erasable multi-session disc
Network attached storage (NAS)
a server that is placed on a network with the sole purpose of providing storage to users,
computer, and devices attached to the network
Storage Area Network (SAN)
a high-speed network with the sole purpose of providing storage to other attached
servers
Tape
a magnetically coated ribbon of plastic capable of storing large amounts of data and
information
Smart card
stores data on an integrated circuit embedded in the card
RFID tag
consists of an antenna and a memory chip that contains the information to be
transmitted via radio waves
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