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Chemistry > 1.3 Input, Output & Storage > Flashcards

1.3 Input, Output & Storage Flashcards

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1
Q

What are some examples of input devices?

A

keyboard
mouse
webcam
magnetic stripe reader (card reader)
barcode reader

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2
Q

What are some examples of output devices?

A

speakers
monitors
printers
headphones

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3
Q

What are 3 categories of storage?

A

optical
magnetic
flash/solid state

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4
Q

What is optical storage?

A

Storage that is read from and written to using lasers. Recessed areas called PITS scatter light to represent 0. Flat portions called LANDS reflect light to represent 1.

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5
Q

What are 3 types of optical storage?

A

CDs
DVDs
blu-ray discs

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6
Q

What does CD stand for and what do they typically store?

A

compact discs used for storing songs, images and text

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7
Q

What are the advantages of CDs?

A

small/thin/light - portable
cheap

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8
Q

What are the disadvantages of CDs?

A

very low capacity
easily damaged by scratches
slow read/write speeds

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9
Q

What is the difference between DVDs and CDs?

A

DVDs have higher storage capacities so they are typically used for storing videos/movies.

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10
Q

What is the advantage of blu-ray?

A

Good for high resolution films as has up to 5 times the storage space of traditional DVDs.

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11
Q

What is magnetic storage?

A

Devices that represent binary information using 2 magnetic states: polarised and unpolarised (1 and 0).

Polarised magnetic material contains aligned magnetic poles whereas unpolarised material has poles pointing in scattered directions.

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12
Q

What are 3 types of magnetic storage?

A

hard disk drives
magnetic tape
floppy disk

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13
Q

What are the advantages of HDDs?

A

high capacities
cheap per gb

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14
Q

What are the disadvantages of HDDs?

A

slower read/write speeds than solid state storage

less portable

easily damaged because of moving parts

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15
Q

What are the advantages of magnetic tape?

A

high storage capacity
durable
cheap per gb

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16
Q

What are the disadvantages of magnetic tape?

A

slower access speeds
only accessed sequentially
heavy
noisy
sensitive to physical damage

17
Q

What is magnetic tape used for?

A

audio files
video files

18
Q

What are the advantages of floppy disks?

A

very small
portable
cheap
good for storing text documents

19
Q

What are the disadvantages of floppy disks?

A

lack of durability
low capacity

20
Q

What are the 2 main flash storage devices?

A

solid state drives
USB sticks

21
Q

What are the advantages of USB sticks?

A

fast read/write
reliable
portable
good price

22
Q

What are the disadvantages of USB sticks?

A

easy to lose
low capacity

23
Q

What are the advantages of SSDs?

A

light and portable
can have high capacities
no moving parts - durable
fast read/write speeds
reliable

24
Q

What is the main disadvantage of SSDs?

A

more expensive per gb than HDD

25
Q

What is the difference between secondary storage and RAM

A

Secondary storage is non-volatile so it retains its content without power.

RAM is volatile so it can’t retain its content without power.

26
Q

What are the 2 types of memory?

A

RAM random access memory
ROM read only memory

27
Q

What is the purpose of RAM?

A

Temporarily stores data and programs that are currently in use.

28
Q

What is the purpose of ROM?

A

Stores fixed sequences of instructions such as a computer’s bootstrap routine. (startup program)

29
Q

What is virtual storage?

A

Storing information remotely so that it can be accessed by any computer on the system over the internet or in a network.

30
Q

Which is volatile and which isn’t out of RAM and ROM?

A

ROM is non volatile like secondary storage whereas RAM is volatile.

31
Q

What are 2 examples of virtual storage?

A

Cloud storage services like google drive

Networked storage used for offices and schools

32
Q

What are the advantages of virtual storage?

A

don’t need to buy hard drives for each computer

convenient to access and share files

33
Q

What are the disadvantages of virtual storage?

A

high cost of cloud storage warehouses

performance limited by user’s network speed

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