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3.4 Computer SystemsKey Facts

How Virtual Memory Works

Part of Virtual Memory · GCSE GCSE Computer Science revision

This key facts covers How Virtual Memory Works within Virtual Memory for GCSE Computer Science. Revise Virtual Memory in 3.4 Computer Systems for GCSE Computer Science with 15 exam-style questions and 16 flashcards. This topic appears less often, but it can still be a useful differentiator on mixed-topic papers. It is section 3 of 10 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.

Topic position

Section 3 of 10

Practice

15 questions

Recall

16 flashcards

How Virtual Memory Works

The Process:

  1. Memory fills up: You open too many programs - Chrome with 20 tabs, Word, Excel, Spotify, Photoshop. Physical RAM (8GB) is now full.
  2. OS intervenes: Operating system identifies less-used data in RAM (e.g., a background program you haven't touched in 10 minutes).
  3. Paging out: OS copies this data from RAM to the page file on the hard drive, freeing up RAM space.
  4. New program loads: The freed RAM is now available for the new program you want to run.
  5. Paging in: When you switch back to that background program, OS swaps it back from hard drive to RAM (paging in) and may page out something else.

Key Terms:

  • Page file / Swap space: Reserved area on hard drive used as virtual memory extension
  • Paging: The process of swapping data between RAM and hard drive
  • Page: A fixed-size block of data (typically 4KB) that gets moved
  • Page fault: When a program tries to access data that's been paged out - OS must page it back in
  • Thrashing: When the system spends more time paging than executing programs (severe slowdown)

Keep building this topic

Read this section alongside the surrounding pages in Virtual Memory. That gives you the full topic sequence instead of a single isolated revision point.

Deep Dive: What is Virtual Memory?Benefits vs. Drawbacks of Virtual MemoryThe Desk with a Filing CabinetWhen Virtual Memory Gets Used

Practice Questions for Virtual Memory

What is virtual memory?

  • A. Extra RAM chips added to the motherboard
  • B. A section of the hard drive used as an extension of RAM
  • C. Cloud storage accessed over the internet
  • D. A type of ROM used during booting
1 markfoundation

Explain how virtual memory works when a user opens more programs than RAM can hold.

3 marksstandard

Quick Recall Flashcards

15 questions on Virtual Memory — practise free

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Deep Dive: What is Virtual Memory?

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Benefits vs. Drawbacks of Virtual Memory