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Computer Science > 1.2 Memory And Storage > Flashcards

1.2 Memory And Storage Flashcards

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1
Q

What is memory ?

A

component of the computer that holds
data, programs and instructions that are currently in use.

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2
Q

What are the two types of Primary memory?

A
  • ROM
  • RAM
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3
Q

Which type of primary memory is volatile ?

A

RAM

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4
Q

Which type of Primary memory is non-volatile ?

A

ROM

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5
Q

What is the average size of Primary memory in a modern personal computer ?

A

4 GB

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6
Q

What is stored in ROM ?

A
  • The BIOS
  • Bootstrap
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7
Q

What is the purpose of the BIOS ?

A
  • Checks hardware is functioning correctly
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8
Q

What is the purpose of the bootstrap ?

A
  • Loads the computer’s operating system
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9
Q

What are the properties of RAM ?

A
  • Data can be stored and accessed from any location within the memory
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10
Q

What does the RAM hold ?

A
  • The OS
  • Open documents and running programs
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11
Q

Can RAM be read from and written to ?

A

YES

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12
Q

What are the pros of having more RAM ?

A

more data and programs it can hold simultaneously

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13
Q

What is Virtual Memory ?

A

A section of a computer storage drive which is temporarily used as RAM.

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14
Q

What is swapping when using VM ?

A

The process of moving data between RAM and secondary storage when using virtual memory.

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15
Q

What are the effects of using VM ?

A
  • Computer runs slowly
  • Disk thrashing
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16
Q

What is secondary storage ?

A

Non-volatile memory external to the CPU and used for long-term storage of programs and data.

17
Q

Why is secondary storage needed ?

A

to keep programs and data indefinitely.

18
Q

What are the three common types of secondary storage ?

A
  • Magnetic
  • Optical
  • Solid State
19
Q

What are the properties of Magnetic devices ?

A
  • Fairly cheap
  • High capacity
  • Durable
  • Vulnerable to magnets and shock
20
Q

How do magnetic devices work ?

A
  • Use magnetised sections as 1
  • As the disk spins a read/write head moves
21
Q

How do optical devices work ?

A
  • Use a laser to scan the surface
  • flat areas = lands = 1
  • hollows = pits = 0
22
Q

What are the three types of optical media /

A
  • ROM
  • R
  • RW
23
Q

How do solid state devices work ?

A

use non-volatile RAM to store data indefinitely

24
Q

What are the properties of solid state devices ?

A
  • Fairly expensive
  • High capacity
  • High durability
  • Portable
  • Reliable
25
Q

What are the 6 factors that determine the application of secondary storage ?

A
  • Cost
  • Capacity
  • Speed of access
  • Portability
  • Durability
  • Reliability

Computer Science (22 decks)

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