1.1.3 - Input, Output and Storage Flashcards

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1
Q

What is the definition of an input device?

A

An input device is a device that can be used to put data and information into a computer.

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2
Q

What is the definition of an output device?

A

An output device is a device that can be used to send information from a computer.

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3
Q

Name two examples of input devices.

A
Mouse
Keyboard
Webcam
Magnetic Stripe Reader
Barcode Reader
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4
Q

Name two examples of output devices.

A

Speakers
Monitor
Printers
Projector

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5
Q

Name the three types of secondary storage.

A

Optical, magnetic, flash.

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6
Q

Describe how optical devices work.

A

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.

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7
Q

Name the three types of optical disc.

A

Compact disc (CD)
Digital Versatile Disc (DVD)
Blu-Ray

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8
Q

What does a CD usually store and what is its capacity?

A

A CD usually stores music/audio files as it only has 700MB of storage capacity.

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9
Q

What does a DVD usually store and what is its capacity?

A

A DVD usually stores standard definition films/video files as it has 4.7GB of storage capacity.

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10
Q

What does a Blu-Ray disc usually store and what is its capacity?

A

A Blu-Ray disc usually stores high-definition films and games as it has 25GB of storage capacity.

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11
Q

Name the three sub-types of optical disc and what they mean.

A

R - Write once
RW - Re-writable
ROM - Read only

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12
Q

Name two types of magnetic storage media.

A

Hard disk drives
Magnetic tape
Floppy disks

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13
Q

How does a hard disk drive work?

A

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.

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14
Q

Name an example of a flash storage device.

A

Solid state drive.

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15
Q

How does a flash storage device work?

A

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.

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16
Q

Name an example of flash storage.

A

Solid state drive (SSD)

17
Q

Describe the properties of magnetic storage.

A

Magnetic storage has high capacity and low cost.

It has medium transfer speeds.

It is reliable but not robust.

18
Q

Describe the properties of optical storage.

A

Optical storage has low capacity and low cost.

It has slow read/write speeds.

It is robust but is susceptible to scratches.

It is very portable.

19
Q

Describe the properties of flash storage.

A

Flash storage has medium capacity but a very high cost.

It has very fast read/write speeds.

It is very reliable.

20
Q

Name two types of primary storage.

A

Random-access memory (RAM) and Read-only memory (ROM)

21
Q

Is RAM or ROM volatile?

A

RAM is volatile.

22
Q

What does volatile mean?

A

If a device is volatile, it loses its data when the power is switched off.

23
Q

What does ROM store?

A

ROM the computer’s start-up (bootstrap) routine.

24
Q

What issues does virtual memory have?

A

Virtual memory decreases the performance of a computer as data is constantly having to be switched between RAM and secondary storage.

25
Q

What is virtual memory?

A

Virtual memory is where secondary storage is treated as if it is RAM.