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OCR H446 1.1.3 Virtual storage mechanism and evaluation

Part 4 of 6 · H446 1.1.3 · Input, output and storage

OCR H446 1.1.3: Virtual storage mechanism and evaluation. Students learn to trace virtual storage from a local-looking view to remote physical media and evaluate its contextual benefits and dependencies.

Students will:

  • trace virtual storage from a local-looking view to remote media
  • distinguish virtual storage from other virtual concepts
  • evaluate benefits and dependencies in context

Inside: 6 explanation cells, 1 multiple-choice question, 2 fill-in-the-blanks cells and 4 written answers. 38 marks, about 55 to 70 minutes.

Series: H446 1.1.3 · Input, output and storage, part 4 of 6.

Shared by Coding PathwayVerified teacher

  • 13 cells
  • About 60 minutes
  • CC BY-SA 4.0
  • Shared 31 Aug 2026
  • Updated 3 Sept 2026

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The whole resource, exactly as a class sees it. Answers and marking are held back.

Virtual storage mechanism and evaluation

Virtual storage is storage physically located elsewhere but presented to a user or system so it can appear local. “Virtual” describes the view or abstraction, not the absence of hardware.

Trace appearance to physical reality

Virtual storage appears local while remaining physically remote local-looking viewfolder or mounted drivewhat the user sees client/OS presents accesstranslates reads, writes and synclocal appearance is an abstraction network/remote path remote service and physical storage mediaservers, drives and replicated storage still existcapacity, access and resiliencedepend on the service and connection Virtual storage ≠ virtual memory ≠ virtual machineName what is virtual and trace where the data or computation really resides.

A file may appear in a mounted drive or synchronised folder. Client software or the operating system turns local-looking read/write actions into remote requests. Servers and physical storage media elsewhere hold the data. Access therefore depends on the service, permissions and network path even when the interface looks local.

Four terms that must not collapse

  • Virtual storage: remote physical storage presented as local-looking storage.
  • Virtual memory: local secondary storage used to extend working memory when RAM is insufficient.
  • Virtual machine: a software-defined computer environment running on a host.
  • Local secondary storage: non-volatile storage directly attached or locally available without the same remote service path.

The first two both mention storage, but they solve different problems and move data for different reasons.

Worked example: shared sound library

A production team sees a shared sound library as drive S: on each workstation. When an editor opens a file, the operating system and client software send a read request over the network; a remote service reads the file from physical storage media and returns the data. The drive appears local, but loss of the network or service can prevent access.

This can help several sites reach the same library and can move storage capacity and maintenance away from each workstation. It does not mean the data is imaginary, locally available offline or automatically safe. A complete explanation traces the local-looking view to a remote request and physical media, then explains one useful effect and one dependency in this situation.

Multiple choice1 mark

A file appears as drive V: on a laptop, but every read is served by storage hardware in a data centre. What is being described?

  • AVirtual memory
  • BRAM
  • CA CPU cache
  • DVirtual storage
Fill in the blanks4 marks
A virtual-storage file may appear gap 1 but is stored on gap 2 physical media. Access normally requires a network or gap 3 path. It must not be confused with gap 4, which uses secondary storage when RAM is insufficient.
  • local
  • remote
  • service
  • virtual memory
  • cache
Written answer10 marks

A field-research team works from several sites and needs shared datasets plus an off-site recovery copy. Explain three benefits and two drawbacks of virtual storage for this team. For every point, state the relevant feature or dependency and explain why it matters to the team.

Relevant benefits may include multi-site access, collaboration/current versions, off-site resilience and expandable allocation. Relevant drawbacks may include connectivity, bandwidth, service dependence, cost or access control when applied. Each developed point is worth 2 marks.

Students type their answer here.

Written answer6 marks

Compare virtual storage with virtual memory. State where data is physically held, what problem each solves, and what triggers or enables access.

Use three matched criteria; avoid comparing virtual storage with RAM alone.

Students type their answer here.

Evaluate a constrained storage design

Apply the remote-path and virtual-concept models to a design with competing access, collaboration, capacity, reliability and resilience needs.

Written answer9 marks

An animation team edits very large files. Internet upload is fast in the morning but unreliable during afternoon reviews. Compare these three designs:

A. Virtual storage as the only working store. B. Local storage only. C. Local working storage with controlled remote synchronisation.

Discuss access, collaboration, capacity, failure and file-version assumptions, then reach a justified conclusion.

Do not invent a security problem without linking it to permissions, service control or a stated threat. In a mixed design, explain how offline work and file conflicts would be managed.

Students type their answer here.

Written answer4 marks

A student says, ‘Virtual storage is not on any real drive, so a building fire cannot affect it.’ Correct the claim and give a more precise resilience explanation.

Separate remote location from guaranteed safety.

Students type their answer here.

Fill in the blanks4 marks
Virtual storage can appear checkpoint gap 1 while residing on checkpoint gap 2 physical media. Virtual memory extends working space using checkpoint gap 3 storage. A recommendation must apply connectivity, access or resilience to the stated checkpoint gap 4.

Consolidate your understanding

Check that each virtual-storage explanation traces local-looking access to remote physical media and applies a real service or network dependency.