Computing - OCR - GCSE - Random Access Memory and Read-Only Memory

Josh Anderson
Mind Map by Josh Anderson, updated more than 1 year ago
Josh Anderson
Created by Josh Anderson about 4 years ago
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GCSE Computing Mind Map on Computing - OCR - GCSE - Random Access Memory and Read-Only Memory, created by Josh Anderson on 02/12/2016.

Resource summary

Computing - OCR - GCSE - Random Access Memory and Read-Only Memory
1 RAM
1.1 What is stored in RAM?
1.1.1 Data in current use
1.1.2 Operating System
1.2 Used in computer systems as the main memory.
1.3 Volatile Memory
1.3.1 Lost when power is lost.
1.4 Used to do immediate tasks.
1.4.1 Quick read/write times
1.5 More RAM - More programs open at the same time
1.6 Virtual memory
1.6.1 When all RAM has been used up, it moves data that has not been accessed recently (Left open in the background for some time) to the hard drive
1.6.1.1 Hard drive has slower read/write times but extends RAM capacity
1.7 Cache memory
1.7.1 Very frequently used data, quicker read/write times than RAM
2 ROM
2.1 Contains prerecorded data. Can only be read, not altered.
2.2 Non-volatile Memory
2.2.1 Not lost when power is lost.
2.3 Stores essential programs (Like ones that allow computer to start up)
2.4 Sometimes used in calculators
2.5 Flash memory
2.5.1 Non-volatile Memory
2.5.2 Solid State technology - no moving mechanical parts
2.5.2.1 Reliable and durable
2.5.2.2 Being developed to contain more and more data
2.5.2.3 Quicker read/write times than hard drives
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