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Computing > 1.1.3 Input Output Storage (new) > Flashcards

1.1.3 Input Output Storage (new) Flashcards

1
Q

List examples of input devices.

A

Keyboards
Webcams
Magnetic stripe readers (read data on cards)
Barcode readers

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2
Q

List examples of output devices.

A

Speakers
Printers
Projectors
Monitors

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3
Q

Give an example of a device that is both input and output.

A

Touch screen.

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4
Q

What factors should be considered for input output devices?

A

Speed, accuracy, cost, relevance to task.

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5
Q

What is used to read and write to optical devices?

A

Lasers.

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6
Q

How is binary info represented on optical devices?

A

Pits and lands written in spiral tracks on the disc’s surface.

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7
Q

On optical devices, what do pits and lands do to light, and what do they represent?

A

Pit: Scatters light and represents 0
Land: Reflects light and represents 1

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8
Q

What does CD stand for?

A

Compact disc.

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9
Q

CDs store small quantities of information. What technology do they use to do this?

A

Optical technology.

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10
Q

What kind of file are CDs most commonly used for?

What could they also store?

A

Audio files.

Could also store text and digital images.

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11
Q

What are benefits of CDs?

A

Very portable due to being small, thin and light

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12
Q

What are downsides of CDs?

A

Limited storage capacity

Slow transfer speeds

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13
Q

What does DVD stand for?

A

Digital video disc / Digital versatile disc

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14
Q

How are DVDs different to CDs?

A

DVDs have higher storage capacity

DVDs are suited to storing digital videos.

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15
Q

How are BluRays superior to DVD?

A

More than five times as much storage than traditional DVDs. This is useful for storing high resolution films.

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16
Q

How do magnetic devices represent binary information?

A

Using two magnetic states: Polarised and unpolarised.

If an area is polarised, magnetic poles are aligned, representing 1.
If an area is unpolarised, magnetic poles are randomly scattered and produce different readings, representing 0.

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17
Q

What is the most common type of magnetic device?

A

HDD

18
Q

How do HDDs work?

A

Magnetic platters rotate at high speeds under a read/write head on an actuating arm.

19
Q

To maximise storage capacity, what do most HDDs have?

A

Multiple platters stacked.

20
Q

What are advantages of HDD?

A

High capacities between 500GB and 5TB

21
Q

What are disadvantages of HDD?

A

Somewhat slow data transfer speeds

Many moving parts introduces tendency to be damaged by movement.

22
Q

How does magnetic tape work?

A

Long stretches of tape wound onto reels passed through readers.

The readers would check the polarity of the tape and read a binary value.

23
Q

What is the downside of magnetic tape?

A

Space consuming way to store data.

24
Q

What is the history of magnetic tape?

A

First used to record computer data in 1950s

Popular storage medium through to the 1980s

25
Q

What is a floppy disk?

A

A thin magnetic disk enclosed in plastic (to protect it from dust and dirt)

26
Q

Floppy disk advantage

A

Extremely portable due to thin size and low weight.

27
Q

Floppy disk disadvantage.

A

Typical storage capacity of 1MB

28
Q

What is good about flash storage?

A
  • It is fast and compact.
  • It can be erased and reprogrammed electronically.
  • It is non volatile
29
Q

What is the downside of flash memory?

A

More expensive per gigabyte than other methods of data storage.

30
Q

What is good about SSD?

A

Extremely light and portable
No moving parts
Much more resistant to damage from movement than HDD
High data transfer rates.

31
Q

What is bad about SSD?

A

Expensive

Limited life span: When a page is written to, the voltage required increases. Over time this becomes too high.

32
Q

What are the two types of primary storage?

A

RAM and ROM

33
Q

What is RAM?

A

A type of fast, volatile main memory used to store data and programs that the computer is currently using.

34
Q

What is good about RAM?

A

Speeds up the computer’s execution due to higher speeds than flash memory.

35
Q

What is bad about RAM?

A

More expensive per gigabyte than secondary storage devices.

36
Q

What is ROM?

A

A non volatile memory that cannot be modified. Once it is programmed, the state of the memory cells inside does not change.

37
Q

What is ROM useful for?

A

Storing fixed sequences of instructions like the bootstrap.

38
Q

What is virtual storage?

A

Remote storage of information that can be accessed by any computer with access to the same system (eg over the internet).

39
Q

What are examples of virtual storage?

A

Cloud storage services such as Google Drive

Networked storage used in offices and schools. (Network Allocated Storage)

40
Q

Virtual storage is becoming popular as a result of what?

A

Increasing internet speeds.

41
Q

Virtual storage is often an abstraction of what?

A

Multiple drives acting like one.

42
Q

While virtual storage is convenient to access and share, what are disadvantages?

A

Limitations of a user’s network speed.
High costs.

Computing (31 decks)

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