Secondary storage
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What 6 words are used to evaluate storage capability
Capacity Speed Portablility Durability Reliability Cost
What is secondary storage
It is a non-volitile,long term storage method
Examples of secondary storage
Cloud storage USB memory stick CD disks SSD’s HDD’s
What is secondary storage used for
To permantly store data or programs To trasport data (in optical disk drives) To backup infomation
Give examples of offline secondary storage
flask sticks optical drives(CD DVD Blueray)
What are the three storage methods
Magnetic Optical Solid State
Explain how magnetic storage works
Mechanical parts read and write data on a disk magnetically on the tracks and sectors
Explain how optical storage works
Lasers read and write data on pits and lands
What are soft plastic disks known as
floppy disks
Pros and cons of magnetic storage
Pros:Cheap Large Capacity Fast write speed Cons:Breakable Prone to wear and tear Very heavy and not very portable
Pros and cons of optical storage
Pros: Cheap Portable Generally quiet Cons: Slow read write speed Low capacity Damage easily
Pros and Cons of Solid State storage
Pros: Very durable fast read/write speeds Quiet Cons: Very expensive Limited amounts of read write times Vunerable to corruption
How does flash memory work
A large electic curreent is used to force electrons through a barrier and trap them on the other side.They remain on thet side until flashed with a new current.
What does capacity mean
How much data can be stored
What does speed mean
The rate data can be read or wrote to
What does Portable mean
How easy it is to carry around
What does durable mean
It mean how stong or sturdy the device is
What does reliablity mean
How likly is it that data can be lost
What does cost mean
Is it cheap or expensive