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Computing > Secondary storage > Flashcards

Secondary storage Flashcards

1
Q

Why is secondary storage needed?

A

For the long-term storage of files and data, as secondary storage is non-volatile

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2
Q

Do embedded systems require secondary storage and why?

A

No, because they do not need to store data when the power is turned off. The instructions needed to run them are stored in ROM and any user data is held in RAM.

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3
Q

What are the 3 types of secondary storage devices?

A

Magnetic, optical and solid state

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4
Q

What is an example of a magnetic storage device?

A

A hard disk drive (HDD)

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5
Q

What are examples of optical storage devices?

A

CD’s, DVD’s and Blu-ray discs

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6
Q

What are examples of solid state storage devices?

A

solid state drives and USB memory sticks

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7
Q

What form is data stored in on secondary storage devices?

A

Binary form

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8
Q

What factors should be considered when thinking of what type of secondary storage device to use?

A
  • Capacity
  • Speed
  • Portability
  • Durability
  • Reliability
  • Cost
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9
Q

What is the capacity of optical storage?

A

650Mb to 50Gb

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10
Q

What is the speed of optical storage?

A

Up to 50mb per second. The speed of optical storage devices is limited because of the presence of moving parts.

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11
Q

How portable is optical storage?

A

Very portable and ligtweight

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12
Q

How durable is optical storage?

A

Easily scratched, damaged, or broken. Also, optical storage devices will degrade over time,especially when exposed to sunlight.

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13
Q

How reliable is optical storage?

A

Quite reliable

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14
Q

How much does optical storage cost

A

50gb for 45p

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15
Q

What’s the capacity of magnetic storage

A

Up to 16TB

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16
Q

What’s the speed of magnetic storage?

A

Up to 200Mb/s. The moving parts mean that magnetic is relatively slow compared to SSD

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17
Q

What’s the portability of magnetic storage?

A

Internal drives are fixed and so aren’t very portable. Whereas external drives are portable and come in pocket sizes.

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18
Q

How durable is magnetic storage?

A

Reasonably durable when not in use. However, can be affected by magnetic fields and heat. Also, van be damaged if dropped or knocked.

19
Q

How reliable is magnetic storage?

A

Very reliable if looked after e.g. if an HDD hasn’t been dropped several times

20
Q

How much does magnetic storage cost?

A

8TB for £120, which is very cheap(cost per byte)

21
Q

What is the capacity of solid state storage?

A

Up to 4TB for an SSD, or 256GB for a flash USB memory stick

22
Q

How fast is solid state?

A

Up to 3.5GB/s as there are no moving parts

23
Q

How portable is solid state storage?

A

Flash drives and memory cards are highly portable. Internal SSD’s aren’t intended to be portable but are very lightweight for use in laptops and tablets.

24
Q

How durable is solid state?

A

Extremely durable because of the lack of moving parts

25
Q

How reliable is solid state storage?

A

Extremely reliable

26
Q

How much does solid state storage cost?

A

4TB for £400

27
Q

What is the life expectancy of a CD?

A

10-25 years

28
Q

Magnetic storage involves the use of….

A

magnetic fields

29
Q

Optical devices involve the use of…

A

lasers

30
Q

How much power do solid state devices require?

A

Not much, which makes it ideal for portable devices where a large enough battery life is needed

31
Q

Which has the greatest storage capacity- optical, magnetic or solid state?

A

Magnetic

32
Q

Which is the fastest secondary storage device?

A

Solid state- due to the lack of moving parts

33
Q

What is the most durable secondary storage device?

A

Solid state- due to the lack of moving parts

34
Q

What’s the most reliable/long lasting secondary storage device?

A

Solid state

35
Q

What’s the cheapest secondary storage device?

A

Magnetic

36
Q

Is solid state cheap or expensive?

A

Very expensive

37
Q

What does DVD stand for?

A

Digital versatile disk

38
Q

What are the 3 types of CD’s?

A

ROM media, Rmedia and RW

39
Q

DVD’s can store ….X more data than CD’s

A

10

40
Q

DVD’s are ….X faster than CD’s

A

20

41
Q

Describe ROM media

A

data is pre-written on ROM media. The data cannot be overwritten. Music, films, software and games are often distributed this way.

42
Q

Describe R media

A

R media is blank and data can only be written once, but read many times. Copies of data are usually made using this media

43
Q

Describe RW

A

RW works in a similar way to R, except that the disc can be written to more than once.

44
Q

What are RW CD’s also knows as?

A

Erasable CD’s

Computing (5 decks)

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