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Level 2

1. 2 Memory 1.3 Storage

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Random Access Memory
Stores Operating system, Running programs, Data currently being used
Volitile - loses data when computer is turned off
Can Read and Write
Read Only Memory
Stores bootup instructions
Non-Volitile - Retains data when computer is turned off
Can only read data from it
More RAM benefit
More programs and data can be held in RAM so they do not need to be swapped out with secondary storage
Virtual Memory
Area on the hard disk which is used as an extension of RAM when it runs out
Secondary Storage
Non-volatile method for storing large amounts of data for long term use
Solid State
Does not use any moving parts e.g. SSDs, USB sticks
Mechanical parts move over the disks surface to read and write data magnetically.
Lasers read and write data using light involving the use of lasers to read and write data, e.g. CD, DVD
Cloud storage
saving data in an off-site storage system maintained by a third party
Cloud advantages
Accessed from anywhere, Back-up data
Magnetic advantages
Cheap, vast storage capability, fast write speed
Magnetic disadvantages
Poor durability, not portable
Optical advantages
Very easily portable, takes up little space physically, Cheap
Optical disadvantages
Poor durability, smaller capacity, slow write speeds
Solid state advantages
Highly durable, no moving parts, very fast read/write speeds, no noisy fan, faster start up times
Solid state disadvantages
Expensive at present, less storage capacity / physical size than traditional hard disks
Flash memory advantages
Low cost, portable, no moving parts, durable