The memory in the computer is divided into main memory and external memory. Main memory is a temporary storage device when calculating data or executing programs. External memory can save data for a long time and has high exchange speed. It is relatively slow, files cannot be saved permanently, and files disappear when the power is turned off.
Computer memory can be divided into two categories: memory (main memory) and external memory.
The difference between memory (main memory) and external memory:
1, different properties:
External memory refers to other than computer memory And memory other than CPU cache can still store data after power is turned off. Commonly used external storage includes hard disks, floppy disks, optical disks, U disks, etc.
Memory is one of the most important components in a computer. It is a bridge to communicate with the CPU. All programs in the computer run in memory, so the performance of the memory has a great impact on the computer.
2, Information storage is different:
After the computer completes the job, the memory storage device does not need to store any information. So if there is no information in memory, what you need will not be found in memory. Unable to save on memory module.
The saved information can only be saved in external memory, such as U disk and floppy disk. At the same time, the external storage capacity is large and easy to carry, so you can find the stored information you want at any time.
3. The running speeds of the two are different:
External memory can save data for a long time, but the exchange speed is relatively slow. The memory exchange speed is very fast, but the files cannot be saved permanently, and the files disappear when the power is turned off. .
Memory is a temporary storage device when calculating data or executing programs. In daily life, it is not suitable for long-term storage of equipment, so its use time is limited.
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Extended information:
The working speed and storage capacity of the memory have a great impact on the overall performance of the system, the scale and efficiency of the system. Memory is a semiconductor memory composed of large-scale integrated circuits. It can be divided into RAM and ROM.
The information in RAM can be read and written randomly, but it cannot be saved for a long time. Once the power is turned off, the information in RAM will not be saved.
Random access memory is divided into static random access memory SRAM and static random access memory DRAM depending on the working principle of the storage unit used.
SRAM uses a steady-state circuit (such as a flip-flop) as a storage unit to store information under normal working conditions, remains stable, and can be read multiple times. The access speed is faster than DRAM, but due to the complexity of the unit circuit characteristics, the integration level is lower than DRAM, and the price is higher.
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