Types of storage(1.1.3 b)
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What is storage?
a term for something that holds information
Describe magnetic storage
can be stored on tape reels, floppy disks or HDDs uses polarity of magnetic field in material to store 1s and 0s needs drive head to physically move across media to read data
Describe optical storage
used mainly for one-way transport of data e.g CD DVD blu-ray uses layers to read and write information
Describe solid state
uses electric-charge held in semi-conductor laltices to store data is written and read by electric current
Three advantages of magnetic storage
cheap large capacity
Three advantages of optical storage
cheap to mass produce lightweight portable
Three advantages of solid state
very fast access times very dense storage capacity durable
Two disadvantages of magnetic storage
slow access time fragile/ susceptible to physical damage easily
Three disadvantages of optical storage
limited capacity scratches can permanently damage data slow access time
Two disadvantages of solid state
expensive limited lifespan/ read and writes