1.1.3 - Input, Output and Storage Flashcards
What is the definition of an input device?
An input device is a device that can be used to put data and information into a computer.
What is the definition of an output device?
An output device is a device that can be used to send information from a computer.
Name two examples of input devices.
Mouse Keyboard Webcam Magnetic Stripe Reader Barcode Reader
Name two examples of output devices.
Speakers
Monitor
Printers
Projector
Name the three types of secondary storage.
Optical, magnetic, flash.
Describe how optical devices work.
Optical devices are read from and written to using lasers. Binary information is represented by portions of the disc which either reflect or scatter the incident light ray. If the laser hits a pit, the light is scattered and a 0 is represented. If the laser hits a land, the light is reflected and a 1 is represented.
Name the three types of optical disc.
Compact disc (CD)
Digital Versatile Disc (DVD)
Blu-Ray
What does a CD usually store and what is its capacity?
A CD usually stores music/audio files as it only has 700MB of storage capacity.
What does a DVD usually store and what is its capacity?
A DVD usually stores standard definition films/video files as it has 4.7GB of storage capacity.
What does a Blu-Ray disc usually store and what is its capacity?
A Blu-Ray disc usually stores high-definition films and games as it has 25GB of storage capacity.
Name the three sub-types of optical disc and what they mean.
R - Write once
RW - Re-writable
ROM - Read only
Name two types of magnetic storage media.
Hard disk drives
Magnetic tape
Floppy disks
How does a hard disk drive work?
A hard disk drive works by rotating magnetic platters under a read/write head on an actuating arm. A magnetically charged particle represents a 1 and a non-magnetically charged particle represents a 0.
Name an example of a flash storage device.
Solid state drive.
How does a flash storage device work?
A flash storage device stores electrical charge in one of two states: high or low. A high electrical charge represents a 1, a low electrical charge represents a 0.