OCR J277 · Component 01 · 1.2.1
RAM, ROM and Volatility
Power faults have scrambled the command station memory map. Inspect the RAM and ROM chambers, restore each allocation, and prove that the system can survive a restart.
- Estimated time
- 25 minutes
- Reward
- 20 XP
- Status
- Public Preview
Theory mission briefing
Know the goal before you begin
Power faults have scrambled the command station memory map. Inspect the RAM and ROM chambers, restore each allocation, and prove that the system can survive a restart.
Mission targets
What you will be able to do
Describe the purpose and key characteristics of RAM and ROM.
Explain the difference between volatile and non-volatile memory.
Select appropriate primary storage for a given purpose.
Need more context? Open the full mission briefing
Power faults have scrambled the command station memory map. Inspect the RAM and ROM chambers, restore each allocation, and prove that the system can survive a restart.
Stage 2 · Learn
Understand the idea
Ready to inspect
Open each concept below to revise the key ideas.
Stage 2 · Learn · OCR J277 1.2.1
Restore the Memory Core
Power faults have scrambled the command station memory map. Inspect the RAM and ROM chambers, restore each allocation, and prove that the system can survive a restart.
Knowledge briefingOpen the theory notes
RAM stores programs and data currently in use. It is normally writable and volatile, so it needs power to retain its contents. ROM stores instructions or data that must persist, such as startup instructions or firmware. It is non-volatile and normally does not change during ordinary use. Volatility describes whether data survives without power; it does not describe speed, danger, or whether memory is read-only.
Mission tip: Look for what must stay available without power and what changes while a program runs.
Mission goals
What you will unlock
Describe the purpose and key characteristics of RAM and ROM.
Explain the difference between volatile and non-volatile memory.
Select appropriate primary storage for a given purpose.
Live system
Test the memory chamber
Changes now. Active, writable and cleared when power is lost.
Survives restart. Non-volatile instructions retained without power.
Comparison scanner
Scan one difference at a time
Select a scan lens to reveal the RAM and ROM comparison.
Rapid challenge
Will it survive a power cut?
Make a quick classification, then use the power rule to check your thinking.
Core knowledge
Three rules to take forward
RAM bay
Active programs and working data; volatile; normally writable.
ROM vault
Persistent startup or embedded instructions; non-volatile; normally unchanged in everyday use.
Volatility test
Power retention is separate from speed and separate from read-only behaviour.
RAM stores programs and data currently in use. It is normally writable and volatile, so it needs power to retain its contents. ROM stores instructions or data that must persist, such as startup instructions or firmware. It is non-volatile and normally does not change during ordinary use. Volatility describes whether data survives without power; it does not describe speed, danger, or whether memory is read-only.
Stage 3 · Apply
Use it in context
Ready to practise
Stage 2 · Apply mission
Diagnostic run 02
Calibrate the Memory Core Chamber
Route each item to RAM or ROM using the evidence from the memory chamber.
Mission briefing
How to clear the diagnostic
Round 1 · Guided decisions
Use the evidence cues
Complete the supported scenarios before transferring the rule independently.
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01 GuidedAwaiting decisionSystem scenario
An image editor is open and processing a photograph.
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02 GuidedAwaiting decisionSystem scenario
A router needs startup instructions after every power cycle.
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03 IndependentAwaiting decisionSystem scenario
A game stores the level currently being played.
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04 IndependentAwaiting decisionSystem scenario
An embedded controller keeps its fixed control instructions.
Complete the guided decisions to unlock Independent.
Round 3 · Private verification
Check the complete diagnostic
Your Guided and Independent decisions are ready. Run the server-owned check below; if anything needs revision, you will return to the relevant round.
Worked Example
An open browser tab and unsaved document data belong in RAM because they are active working data. Router startup firmware belongs in ROM because the instructions must remain available after power is removed.
Common Mistakes Tips
RAM is not permanent storage
active data is lost without power.
ROM is not a hard drive or SSD
it is primary storage used for persistent instructions.
Volatile does not mean dangerous
it means power is required to retain contents.
More RAM does not increase CPU clock speed
it can reduce memory pressure and reliance on virtual memory.
Stage 4 · Mission
Complete the challenge
Ready to prove
Stage 3 · Final mission
Mastery operation 03
Restore the Memory Core
Power faults have scrambled the command station memory map. Inspect the RAM and ROM chambers, restore each allocation, and prove that the system can survive a restart.
Mission protocol
Restore the system in four moves
Allocation deck
Resolve every system node
Use the scenario clue, then lock one decision on each card.
Station startup firmware
Programs currently running
Unsaved command log edits
Permanent door-controller instructions
Temporary simulation level data
Evidence transmission
Prove why your allocations work
Link the scenario to retention, active use, capacity or performance.
Review the protocol, then begin allocating the system nodes.
Stage 5 · Complete
Review your progress
Lesson summary
Diagnostic locked
Pass the Mission first
The review is generated only after the assessed final challenge has been submitted and passed at 80% mastery.
Verified diagnostic
Memory Core Restored
The final mission has been server-validated. Compare each decision with the evidence before claiming the reward.
Your passed diagnostic is saved. Revisit the mission evidence whenever you need a refresher.
Use the requirement as evidence: retention, active use, capacity, then performance.
Misconceptions to keep correcting
RAM is not permanent storage: active data is lost without power.
ROM is not a hard drive or SSD: it is primary storage used for persistent instructions.
Volatile does not mean dangerous: it means power is required to retain contents.
More RAM does not increase CPU clock speed: it can reduce memory pressure and reliance on virtual memory.
Quick Check
Use evidence: persistence points to ROM, active changeable data points to RAM, and insufficient RAM may trigger slower virtual memory.
Key Terms Recap
Common Mistakes Tips
Thinking RAM is permanent
RAM is volatile and loses contents when power is off.
Confusing ROM with normal file storage
ROM stores start-up instructions, not everyday user files.
Thinking cache is secondary storage
Cache is small, fast memory used close to the CPU.
Saying stores data too vaguely
Exam answers should explain what kind of data or instructions and why.
Forgetting primary storage is fast access
The CPU needs quick access to active instructions and data.