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Storage (Choosing the Best Storage Media (Capacity: The amount of data…
Storage
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Optical Storage
Optical storage includes CD, DVD and Blu-ray disks.
A laser beam burns tiny dark pits on to the surface of the optical disk. If a pit is present, this can represent a data bit being '1' and if no pit is present, this can represent a data bit being '0'.
Advantages
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Ideally sized (5 - 50GB) for storing movies and videos. Which is why they were created in the first place.
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Magnetic Storage
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Calculating storage
example 1: music storage on a smart phone
You have a smart phone with 6GB of storage.
You want to store music and photos on the phone.
A typical mp3 encoded music file takes up 4MB.
How many tracks can be stored on the phone?
Convert GB into MB.
6GB = 6000MB
Answer: 6000 MB/4 MB = 1,500 music files
Solid State Media
Solid state media hold data using electronic switches. If the switch is open, it represents a '1', since it retains an electric charge. If it is closed, it represents a '0'. It is an electrical form of storage, unlike magnetic or optical media. The technology is called 'Flash memory'.
Advantages
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Large capacity, especially in the form of a solid state drive.
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Disadvantages
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Less durable than a hard disk as it has a limited number of erase \ write cycles - maybe a 100,000 cycles before it wears out.
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