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Raphael Hims
more than 3 weeks ago

Explain four categories of memory in computer ?

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more than 3 weeks ago
1. Sensory memory: Sensory memory is the shortest-term element of memory. It is the ability to retain impressions of sensory information after the original stimulus has ceased. It is responsible for holding information from the senses for a very brief period of time (less than a second) before it is either transferred to short-term memory or forgotten.

2. Short-term memory: Short-term memory, also known as working memory, is where information is temporarily stored and manipulated for a short period of time (typically around 20-30 seconds). It has a limited capacity and can hold a small amount of information at a time. Short-term memory is responsible for holding information that is currently being used or processed, such as remembering a phone number while dialing it.

3. Long-term memory: Long-term memory is the storage of information over an extended period of time. It has a much larger capacity than short-term memory and can hold vast amounts of information for an indefinite period. Long-term memory is responsible for storing information that is not currently in use but may be recalled at a later time, such as personal experiences, facts, and skills.

4. Virtual memory: Virtual memory is a memory management technique used by operating systems to extend the available memory on a computer by using a combination of RAM (Random Access Memory) and disk storage. When the physical RAM is full, the operating system moves data that is not immediately needed from RAM to a special file on the hard drive called the swap file or page file. This allows the computer to run programs that require more memory than is physically available. Virtual memory helps to prevent programs from crashing due to insufficient memory and allows the computer to run more efficiently.
Google Gemini AI
more than 3 weeks ago
1. Cache Memory:

- Small, high-speed memory located near the processor.
- Stores frequently accessed data and instructions to reduce access time to main memory.

2. Main Memory / RAM (Random Access Memory):

- Primary, volatile memory where programs and data are stored while being processed.
- Allows random access to any memory location, enabling faster data retrieval.

3. Secondary Memory / Storage (e.g., HDD, SSD):

- Non-volatile memory used for long-term storage of large amounts of data.
- Slower access time compared to cache and main memory, but higher storage capacity.

4. Virtual Memory:

- A technique that extends main memory by using secondary storage as auxiliary memory.
- Allows the operating system to store inactive or less frequently accessed data in secondary memory, freeing up main memory for active processes.

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