used by humans to process info. used to make sense of the world around us
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What is digital data
used by computers to process info.
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facts about analogue data
is a continuous range of values
Changes smoothly
needs to changed into digital for a computer to understand
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facts about digital data
is stored as discrete values
is made up of binary digits (bits)
digital can't be processed by a human so need to be converted into analogue
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analogue devices
Clocks
thermometers
scales
cassette tape
film camera
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Digital devices
digital camera
smart phone
tablet
Vr headset
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what is a binary digit
1s and 0s
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what is 1 binary digit called
a bit
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what is 4 bits called
a nibble
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8 bits are ....
a byte
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1,024 bytes are
1 kilobyte
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1,024 kilobytes are
1 megabyte
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1,024 megabytes are
1 gigabyte
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1,024 gigabytes are
1 terabyte
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1,024 terabytes are
1 petabyte
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what is a magnetic storage system
a storage that uses magnetic coating. magnetized dots are made on the surface of the material. these dots are created, read and deleted by small electric magnets
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examples of a magnetic storage
Computer hard drives
digital cassette tapes
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common uses of a magnetic storage
saving work
backing up work on a network
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how much storage on a magnetic storage
Pc = 1TB
Cassette tape = max 1TB
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Advantages of magnetic storage
Large capacity
Low cost
High speed
Random access
holds for 30 years
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disadvantages of magnetic storage
not as portable
mechanical moving parts
Data can be lost
magnetic tape is slow
not as fast to access stuff like a SSD
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what is a computer Hard drive
main storage on a computer works like a filling cabinet
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is a hard drive magnetic
yes
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What is Optical storage
your DVDS and blu rays they use lasers to shine and reflect data
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examples of optical storage
DVD
CD
Blu-ray
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what is optical storage used for
storing/copying music and movies
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how much storage does each optical storage option have
DVD = 1 side has 4.7GB. 2 sides has 8.5GB
CD = around 700MB
Blu-ray = 1 side 25GB 2 sides has 50GB
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advantages of optical storage
Cheap if less than 10GB
Very portable
Ideally sized
not effected by magnetic fields
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disadvantages of optical storage
not cheap if TB needed
not as portable as USB
Slow to write
easily scratched
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