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Chapter 1: Problem 23

Both main memory and secondary storage are types of memory. Describe the difference between the two.

Short Answer

Expert verified
Answer: Main memory, also known as primary memory or RAM, is the computer's short-term, volatile memory used for processing and temporarily storing data that is directly accessible by the CPU, and it is faster than secondary storage. Secondary storage, also known as auxiliary memory, is the computer's long-term, non-volatile storage used for storing data not currently being processed and has a larger storage capacity compared to main memory. The main differences between them are speed, performance, storage capacity, and cost.

Step by step solution

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1. Definition and Characteristics of Main Memory

Main memory, also known as primary memory or RAM (Random Access Memory), is the computer's short-term memory that stores data and instructions the computer is currently using or processing. It is a volatile memory, meaning it loses its data when the computer is turned off or loses power. Main memory is fast and directly accessible by the CPU (Central Processing Unit).
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2. Definition and Characteristics of Secondary Storage

Secondary storage, also known as auxiliary memory or non-volatile storage, is the computer's long-term storage that is used for storing data that is not currently being processed or used by the CPU. It retains its data even when the computer is turned off, meaning it is non-volatile. Secondary storage devices include hard disk drives (HDDs), solid-state drives (SSDs), CDs, DVDs, and USB flash drives. Secondary storage is slower compared to main memory and is not directly accessible by the CPU. The data from secondary storage needs to be transferred to the main memory before it can be used by the CPU.
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3. Comparison of Speed and Performance

Main memory is considerably faster than secondary storage because it is designed for quick data access and is directly connected to the CPU. On the other hand, secondary storage, which is often used to store large amounts of data, has a slower data access speed as the data needs to be transferred to the main memory first before it can be accessed by the CPU.
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4. Comparison of Storage Capacity and Cost

Secondary storage typically has a much larger storage capacity compared to main memory. This is because secondary storage is designed to store large amounts of data, including operating systems, applications, and personal files. In terms of cost, main memory is generally more expensive per unit of storage compared to secondary storage due to its higher speed and performance.
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5. Summary of the Differences

Main memory and secondary storage are both types of memory with different purposes, characteristics, and usage in a computer system. Main memory is fast, short-term, volatile storage that is directly connected to the CPU and used for processing and temporarily storing data. Secondary storage is slower, long-term, non-volatile storage used for storing data not currently being processed. The key differences between them are the speed, performance, storage capacity, and cost.

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