The Need for Secondary Storage (AQA GCSE Computer Science)

Revision Note

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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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