What is the difference between internal memory and external memory?

Differences: 1. In terms of speed, internal memory is at least a hundred times faster than external memory; 2. Memory capacity is generally only a few G, and the larger ones are 16G, 32G, etc., while external memory, such as hard drives, can be anything. Just a few; 3. When the memory is shut down and the power is cut off, all data will be lost, but the external memory will not be affected, and the data will always be there.

The operating environment of this article: Windows 7 system, Dell G3 computer.

Internal memory refers to the main memory of the computer and the cache located between the CPU and the main memory. External memory refers to the auxiliary memory of the computer, including hard disks, floppy disks, optical disks, etc.

Internal memory is mainly used to temporarily store the instructions and data being used by the CPU. It is most closely related to the CPU. Since the programs and data it stores need to be used immediately, it requires fast access speed, usually made of semiconductors. Memory composition. The CPU fetches instructions and stores data directly from the main memory. Information is not saved after power is turned off.

External memory is used to store information that does not need to be used immediately. Once needed, it will exchange data with the main memory in batches. It exists as a backup and supplement to the main memory and is an external device of the host. It is characterized by large capacity and low cost. It can usually still save information after a power outage. It is a "non-volatile" memory. Most of the storage media can also save information offline.

There are three indicators for measuring memory: capacity, speed and price/bit. Therefore, the price per bit of memory with high speed is relatively high, so the capacity cannot be too large, so it must be divided into memory and external memory. The information used is placed in the high-speed memory, and the temporarily unused information is placed in the external memory. However, they are all storage systems of the computer, and a storage hierarchy is formed between them. Overall, the computer has a speed and approximation similar to that of the memory. on the capacity of external memory.

The difference between internal memory and external memory

1. The speed is different. Memory is at least a hundred times faster than external memory. The fastest external memory is the hard disk, and the slowest is the floppy disk.

2. Different capacities. The memory capacity is generally a few G, and the larger ones are 16G, 32G, etc., while the external memory, such as a hard disk, is just a few T.

3. The volatility is different. If the memory is turned off and the power is turned off, all data will be lost, but the external memory will not be affected, and the data will always be there.

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