Memory & Storage — A-Level Computer Science Revision
Revise Memory & Storage for A-Level Computer Science. Step-by-step explanation, worked examples, common mistakes and exam-style practice aligned to AQA, Edexcel and OCR.
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Go to Input/Output DevicesWhat is Memory & Storage?
Memory and storage are both used to store data, but they have different characteristics. Memory (RAM) is volatile and is used to store data that the CPU is actively using. Storage (e.g., a hard drive or solid-state drive) is non-volatile and is used to store data for the long term.
Board notes: A fundamental topic for AQA, Edexcel, and OCR. Students should be able to explain the difference between memory and storage and describe the different types of memory and storage devices.
Step-by-step explanationWorked example
When you open a program, it is loaded from storage into memory. The CPU can then access the program's instructions and data from memory. When you save a file, it is written from memory to storage. When you close the program, it is removed from memory.
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Common mistakes
- 1Confusing memory and storage.
- 2Not understanding the difference between RAM and ROM.
- 3Thinking that virtual memory is a type of physical memory.
Memory & Storage exam questions
Exam-style questions for Memory & Storage with mark-scheme style solutions and timing practice. Aligned to AQA, Edexcel and OCR specifications.
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Step-by-step method
Step-by-step explanation
4 steps · Worked method for Memory & Storage
Core concept
Memory and storage are both used to store data, but they have different characteristics. Memory (RAM) is volatile and is used to store data that the CPU is actively using. Storage (e.g., a hard drive …
Frequently asked questions
What is the difference between a hard drive and a solid-state drive?
A hard drive is a mechanical device that stores data on a spinning platter. A solid-state drive (SSD) is an electronic device that stores data on flash memory chips. SSDs are faster, more durable, and more energy-efficient than hard drives.
What is cache memory?
Cache memory is a small, fast type of memory that is used to store frequently accessed data. It is located closer to the CPU than main memory, so it can be accessed more quickly. This helps to improve the performance of the CPU.