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OUTPUT DEVICE 2.5.4 / STORAGE 2.5.5 (Output Device 2.5.4 (Any hardware…
OUTPUT DEVICE 2.5.4 / STORAGE 2.5.5
Output Device 2.5.4
Any hardware component that conveys
information to people.
Printer
• An output device that produces text and
graphics on a physical medium such as paper.
• Printed information, called hardcopy, exists
physically and is more permanent than
softcopy.
Impact printers
– Forms characters and graphics on a piece of paper
by striking a mechanism against an inked ribbon
that physically contacts the paper.
– Noisy, and print quality is slightly less clear
– Used in business for routine jobs such as printing
labels or multilayers forms.
– Examples of impact printer are dot-matrix printer
and line printer.
Nonimpact printers
– Form characters and graphics on a piece of paper
without actually striking the paper.
– Form characters and graphics by spraying ink,
using heat, or using pressure.
– Quiet, and better print quality
Laser printer
– Uses laser beam and powdered ink to transfer
images onto paper.
– high-speed and high quality nonimpact printer
Thermal printer
Generates images by pushing electrically heated
pins against heat sensitive paper.
Ink-jet printer
Sprays tiny drops of liquid ink onto a piece of
paper.
Plotter.
– Sophisticated printer used to produce high-quality
drawings such as blue-prints, maps and circuit
diagrams.
– Used in specialized fields such as engineering and
drafting and usually are very costly
Audio output
A component of a computer that produce
music, speech or other sound.
Headphones
Earbuds
Speakers
Display device
An output device that visually conveys text,
graphics and video information.
• Information on a display device, called
softcopy, exists electronically and appears for
a temporary period.
LCD monitor
– A desktop monitor that uses a liquid crystal
display to produce images.
– Offers sharp, flicker-free images, lighter and
thinner, and more energy saving compared to CRT
monitors.
Plasma monitor
– A display device that uses gas plasma technology
to produce images.
– Offer larger screen size and richer colors than LCD
monitor, but more expensive.
CRT monitor
– A desktop monitor that uses a cathode-ray tube to
produce images.
– Bigger and bulkier LCD monitor, consume more
power and prone to screen flicker.
LED monitor
– A display that uses an array of light-emitting
diodes to produce images.
– Offers better color quality, clarity, and better
energy savings.
Video output
LCD Projector
– A type of video projector for displaying video,
images or computer data on a screen or other flat
surface.
– It is a modern equivalent of the slide projector or
overhead projector.
HDTV
– HDTV (high definition television) is a the most
advance form of digital television that provide
very high resolution.
– Often used as output for game consoles such as
Microsoft’s Xbox and others.
– Users plug one end of a cable in the game console
and the other end in the video port of the
television.
2.5.5 Storage
• Storage is a technology consisting of computer
components and recording media used to
retain digital data.
• Storage media, also called secondary storage,
are devices that store data, instructions, and
information permanently.
Characteristics of Storage
• Storage is non-volatile; it does not lose its
contents even when the power is off.
• Storage has bigger capacity compared to
memory, which has limited capacity.
• Transfer rate of storage is slower compared
with the transfer rate of memory.
Types of Storage Media
Optical Disc
• Storage media that consists of flat, round,
portable disc made of metal, plastic and
lacquer that is written and read by a laser.
• Stores data in deformities on the surface of a
circular disc and reads this data by
illuminating the surface with a laser diode and
observing the reflection
DVD
• A type of optical disc used to store videos,
films, and large programs.
• Higher storage capacity and better image
quality compared to CD.
• Types of DVD:
– DVD-ROM, DVD-R, and DVD-RW
BD
Types of Storage Media: Optical Disc:
Blu-Ray Disc
• A type of optical disc used to store highdefinition
and ultra high-definition videos and
movies.
• It uses a blue laser instead of a red laser to
read and write data on the disc.
CD
Types of Storage Media: Optical Disc:
Compact Disc (CD)
• A type of optical disc used to store data,
songs, drivers, and program files.
• Types of CD:
– CD-ROM
– CD-R
– CD-RW
Flash Memory Storage
• Flash memory storage is storage media that
uses solid-state chip that maintains stored
data without any external power source.
• commonly used in portable electronics and
removable storage devices.
• More durable and shock resistant than other
types of secondary storage because it contains
no moving parts.
Memory card
• Flash memory storage that users insert and remove
from a slot in personal computer, smartphone, digital
camera, or card reader/writer.
• Examples: CompactFlash, microSD, Memory Stick Micro
Solid state drive (SSD)
• Flash memory storage that offers faster data transfer
rate, used in all types of computers and mobile devices.
• May eventually replace storage media with moving
parts such as hard disk and optical disc.
USB flash drive
Flash memory storage that users plug in a USB port on
computers or mobile devices.
Magnetic Storage
• Devices that store data in the form of tiny
magnetised dots. These dots are created, read
and erased using magnetic fields created by
very tiny electromagnets.
Hard disk
• Storage device that contains one or more
inflexible, circular platters that use magnetic
particles to store data, instructions and
information.
• Hard disk stores operating system, application
software, users’ data and information, and
backup.
Characteristics of hard disk:
– Capable to store large amount of data.
– Direct access device; a file can be access
randomly, not following the sequence it is stored.
– Faster data access compared to tape.
Tape
• Magnetically coated ribbon of plastic capable
of storing large amount of data.
• Tape is mainly used for storing backup data.
Characteristics :
– Capable to store large amount of data.
– Sequential access device; a file have to be
accessed in sequence.
– Slower data access compared to hard disk.