Secondary Storage Flashcards

1
Q

When may virtual memory be needed?

A

When too many applications are open at once, or if a memory intensive application is being used.

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2
Q

What is virtual memory?

A

Data that is not frequently used moved to a location on secondary storage.

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3
Q

What is secondary storage?

A

Where all data is stored when not in use. It is also non-volatile.

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4
Q

What does HDD stand for?

A

Hard Disk Drive

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5
Q

What is a HDD made up of?

A

Magnetised metal disks spinning at 5400 to 15000 rpm

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6
Q

How is data on a HDD stored?

A

Magnetically in small areas known as sectors within circular tracks.

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7
Q

How is data read/written to a HDD?

A

With a read/write head on a moving arm to access sectors on the disks.

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8
Q

What does SSD stand for?

A

Solid State Drive

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9
Q

What do most SSDs use?

A

A type of flash memory

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10
Q

What are some examples of flash storage?

A

USB pen drives, memory cards

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11
Q

What are the advantages of HDDs over SSDs?

A

Cheaper, higher capacity, longer read/write life

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12
Q

What are the advantages of SSDs over HDDs?

A

Faster, don’t need defragmenting, more shock-proof, silent

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13
Q

What are some examples of optical disks?

A

CDs, DVDs and Blu-Ray

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14
Q

What is the capacity of a CD?

A

700MB

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15
Q

What is the capacity of a DVD?

A

4.7GB

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16
Q

What is the capacity of a Blu-Ray disk?

A

25GB

17
Q

What are the advantages of optical disks?

A

Very cheap per GB, portable, won’t be damaged by water and shocks, however they are easily scratched.

18
Q

What type of secondary storage typically gives the greatest capacity?

A

Magnetic tape

19
Q

What type of secondary storage typically gives the smallest capacity?

A

Optical disk

20
Q

What type of secondary storage typically is the cheapest?

A

Magnetic tape

21
Q

What type of secondary storage typically is the most expensive?

A

SSDs

22
Q

What type of secondary storage typically gives the greatest read/write speed?

A

SSDs

23
Q

What type of secondary storage typically gives the slowest read/write speed?

A

Optical disks