3.3: data storage and compressions Flashcards

1
Q

kilobyte

A

1000 kB

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2
Q

megabyte

A

1000² MB

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3
Q

gigabyte

A

1000³ GB

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4
Q

terabyte

A

1000⁴ TB

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5
Q

kibibyte

A

1024 KiB

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6
Q

mebibyte

A

1024² MiB

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7
Q

gigibyte

A

1024³ GiB

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8
Q

tebibyte

A

1024⁴ TiB

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9
Q

compression methods

A

lossless
lossy

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10
Q

advantages of data compression

A

makes storage more efficient
allows you to upload and download files faster

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11
Q

lossless compression

A

do not lose any data
data can be reversed to what it was before
use shorthand to store data

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12
Q

examples of lossless compression

A

ZIP file
RLE (run length encoding)

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13
Q

ZIP file

A

if you add files to a ZIP they take up less space but are exactly the same when you unzip them

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14
Q

RLE

A

RLE encodes data items and how long it runs

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15
Q

example of RLE

A

55555511111333
turns into:
(6 5) (5 1) (7 3)

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16
Q

lossy compression

A

removes data that us unnecesary
data cannot be restored to what it was before as data is lost

17
Q

use of lossy compression

A

multimedia
for audio files by removing sounds outside the range that humans can hear

18
Q

example of lossy compression

A

MP3
this means less space required and faster streaming
JPEG
decreases size of image