1.2 Memory & Storage Hub

Conceptually understand the difference between Volatile Primary Memory and Permanent Secondary Storage.

Examiner's Eye: High-Grade Technique

The "Memory" Generalisation Trap: Never just write "Memory" in an exam. Examiners will not award marks unless you specifically write RAM, ROM, or Secondary Storage. They have entirely different volatility states and purposes.

The Volatility Power Simulator

Cut the system power and watch which storage components lose their data.

System Power: ON

RAM (Primary)

VOLATILE
Windows OS (Running) 1.2GB
Web Browser 400MB
Fortnite.exe 2.1GB

ALL DATA ERASED!

Requires power to hold state.

ROM (Primary)

NON-VOLATILE
Bootstrap Loader
BIOS Configuration
POST Instructions

Factory flashed. Safe from power loss.

Storage (Secondary)

NON-VOLATILE
Windows OS (Saved on disk)
Essay.docx
music.mp3

Saved permanently via magnetism/flash.

The Golden Rule: The CPU can only execute programs if they are currently loaded into RAM. If you cut the power, RAM forgets everything, and the OS must be loaded back from the sluggish Secondary Storage on next boot!

Full Unit Modules

Deep-dive into specific 1.2 components.

1.2.1

Primary Storage

RAM, ROM, Cache and Virtual Memory mechanics.
1.2.2

Secondary Storage

Optical, Magnetic, and Solid State devices.
1.2.3

Units & Capacities

Bits, Bytes, and file size calculations.
1.2.4

Data Representation

Binary addition, logic shifts, ASCII vs Unicode, Pixels, and Sound sampling.
1.2.5

Compression

Lossy vs Lossless algorithms and uses.

Check Your Understanding

1. What is the fundamental difference between Volatile and Non-Volatile storage?

2. Which component stores the computer's boot instructions?

3. A teacher reminds a student not to fall into the "Memory" trap in an exam. Why?

Written Exam Scenario (AO3)

1 / 3

"A tech enthusiast suggests that modern computers should discard slow Secondary Storage entirely, and build motherboards with 5 Terabytes of RAM instead. Using your knowledge of volatility, explain why this computer would be impossible to use daily." (4 marks)