The Need for Secondary Storage (AQA GCSE Computer Science)
Revision Note
Written by: Robert Hampton
Reviewed by: James Woodhouse
The Need for Secondary Storage
Computer systems need both main memory and secondary storage to operate
Both types of storage play a crucial role in the operation of a computer system
A quick comparison of main memory and secondary storage shows:
Main memory | Secondary storage |
|---|---|
Volatile (with the exception of ROM) | Non-volatile |
Small capacity | Large capacity |
Why do you need secondary storage?
A computer needs secondary storage for long term storage of programs and data that are currently not in use
Secondary storage is needed as ROM is read only and RAM is volatile
Secondary storage holds the programs and data whilst the computer is turned off (non-volatile)
Performance of secondary storage is slower than primary storage but capacity is much higher which makes it perfect for backup & archive of data files
What are the characteristics of secondary storage?
Capacity - What is the maximum amount of data that can be stored?
Speed - How fast can data be read from and written to? (R/W)
Cost - How much does it cost?
Portability - How easy is it to move around? What is the physical size? Weight?
Durability - How robust is the storage?
Reliability - What is the probability that the device will consistently perform its function?
Worked Example
A games console has secondary storage.
State, using an example, why the games console needs secondary storage [2]
How to answer this question
They keyword is 'why', why does a games console need secondary storage? give an example, do not just describe what secondary storage is!
Answer
To store data once the power is turned off / permanently // for non-volatile storage
Examples could include:
Storing games
Save games
User data / profiles
Downloaded content / applications / updates
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