GCSE OCR Computer Science: Memory & Storage Crash Course | GCSE OCR 计算机科学：存储器考点精讲

📚 GCSE OCR Computer Science: Memory & Storage Crash Course | GCSE OCR 计算机科学：存储器考点精讲

In the GCSE OCR Computer Science specification, understanding the types, features, and purposes of memory and storage is essential. This topic covers primary memory (RAM and ROM), virtual memory, and a wide range of secondary storage devices. Being able to compare their characteristics such as speed, capacity, durability, portability, and cost will help you choose the right storage for a given scenario and excel in exam questions.

在 GCSE OCR 计算机科学大纲中，掌握存储器的类型、特性和用途至关重要。本专题涵盖主存储器（RAM 和 ROM）、虚拟内存以及各种辅助存储设备。能够比较它们的速度、容量、耐用性、便携性和成本等特性，将帮助你在不同情境下选择合适的存储设备，并在考试中取得高分。

1. Primary vs Secondary Storage | 主存储器与辅助存储器的区别

Primary storage, often referred to as main memory, is directly accessible by the CPU. It includes RAM and ROM, and is used to hold data and instructions that the processor is currently working on. Primary storage is typically volatile (RAM) or non-volatile but read-only (ROM), and has much faster read/write speeds compared to secondary storage, but offers limited capacity and higher cost per gigabyte.

主存储器（Primary storage），通常称为内存，是 CPU 可以直接访问的存储器。它包括 RAM 和 ROM，用于存放处理器当前正在处理的数据和指令。主存储器通常是易失性的（如 RAM）或非易失性但只读的（如 ROM），其读写速度比辅助存储器快得多，但容量有限，且每 GB 成本更高。

Secondary storage, on the other hand, is not directly accessible by the CPU. Data must first be loaded into primary memory. Secondary storage devices such as hard disk drives, SSDs, optical discs, and USB flash drives provide non-volatile, long-term storage at a lower cost per byte and much larger capacities, though they are significantly slower.

辅助存储器（Secondary storage）则不同，CPU 不能直接访问，数据需要先加载到主存储器中。辅助存储设备如硬盘驱动器、固态硬盘、光盘和 USB 闪存驱动器，提供非易失性的长期存储，每字节成本更低、容量大得多，但速度明显较慢。

2. RAM: Random Access Memory | 随机存取存储器 (RAM)

RAM is a volatile primary memory, meaning it loses all stored data when the power is turned off. It is used to store the operating system, application programs, and data currently in use so that the processor can access them quickly. Modern computers typically have between 4 GB and 64 GB of RAM.

RAM 是一种易失性主存储器，这意味着当电源关闭时，所有存储的数据都会丢失。它用于存储正在使用的操作系统、应用程序和数据，以便处理器能够快速访问。现代计算机通常配备 4 GB 到 64 GB 的 RAM。

The term “random access” means that any storage location can be accessed directly, taking roughly the same time regardless of its physical location. This makes RAM extremely fast. The main types are DRAM (Dynamic RAM), which needs constant refreshing, and SRAM (Static RAM), which is faster but more expensive and used in cache memory.

“随机存取”一词意味着任何存储位置都可以直接访问，无论其物理位置如何，访问时间大致相同。这使得 RAM 速度极快。主要类型有

Published by TutorHao | GCSE Computer Science Revision Series | aleveler.com

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