Virtual Memory

Lesson Instructions

Watch and follow the YouTube video, the lesson contains three parts:

  1. Key Information and content - all you need to do here is watch and listen

  2. Learning activity - this activity is identifying the advantages and disadvantages of virtual memory

  3. Consolidation - these are past exam question and are for deliberate practice to check your understanding.

Task - Advantages & Disadvantages

Task - Exam Questions - Deliberate Practice

Exam Questions - Virtual Memory

Mark Scheme

Question 1 (a)

1 mark per bullet to max 3

  • VM is used when RAM is full

  • ...part of the secondary storage used as (temporary) RAM/VM

  • Data from RAM is moved to the secondary storage/VM (to make space in RAM)

  • RAM can then be filled with new data

  • When data in VM in needed it is moved back to RAM

Question 1 (b)

1 mark per bullet to max 2

  • More RAM will improve the performance of the computer

  • Excessive use can cause disk thrashing...

  • ...which decreases performance

  • VM is slower to access than RAM direct (because it has to go back to RAM first)

  • Moving data between RAM and VM takes processor time.

Question 2

1 mark per bullet to max 3

  • Allow user to run programs there is insufficient RAM for

  • Move data not recently used to HDD to free up space in RAM

  • ...to be filled by new data required to be stored in RAM

  • Allows her to run more programs simultaneously with less slow down.