Memory, Storage, Input, Output and Connectivity
Comparing contemporary memory, storage and peripheral technologies by capacity, speed, volatility, durability, accessibility and purpose.
How to study A-level Computer Science
Define the problem and representation, trace the state change, justify the algorithm or architecture, then test the result against requirements, evidence and constraints.
Core concepts
Concept 1
Primary memory supports active processing, while secondary storage retains programs and data beyond power cycles.
Exam cue: Choose technology from the stated workload and constraints rather than one headline specification.
Concept 2
Input and output devices translate between the computer system and users, sensors, actuators or other systems.
Exam cue: Trace the complete path from physical signal or user action to stored or processed data.
Concept 3
Connectivity choices trade bandwidth, latency, reliability, distance, energy, compatibility and security.
Exam cue: Separate theoretical transfer rate from latency and observed throughput.
Risk pitfalls and guardrails
Using memory and storage as exact synonyms.
Guardrail: Do not substitute a memorised definition or generic advantage until you have identified the input, state, stakeholder and constraint in the task.
Assuming the device with greatest capacity is always most suitable.
Guardrail: Do not substitute a memorised definition or generic advantage until you have identified the input, state, stakeholder and constraint in the task.
Ignoring interface compatibility and transfer bottlenecks.
Guardrail: Do not substitute a memorised definition or generic advantage until you have identified the input, state, stakeholder and constraint in the task.
Memory anchors
RAM
RAM is directly usable working memory and is normally volatile.
ROM
ROM retains instructions or data without normal write access during operation.
Secondary Storage
Secondary storage provides persistent capacity for programs and data.
Latency
Latency is the delay before a transfer or response begins.
Throughput
Throughput is the useful amount of data transferred per unit time.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
What is the key property of RAM used as main memory?
What is ROM commonly used for?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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