The fastest access memory is "internal memory"; the memory in the computer adopts a hierarchical structure, arranged in order of speed, including internal memory, cache memory, computer's main memory, and large-capacity disk. The memory is generally divided into RAM random access memory and ROM read-only memory.
The operating environment of this tutorial: Windows 10 system, DELL G3 computer.
The fastest access speed in memory is internal memory. The memory in the computer adopts a hierarchical structure
Arrange storage speed from fast to slow: Internal memory>Cache memory>Computer's main memory>Large-capacity disk
The central processing unit (CPU) can only directly access the data stored in the memory, while the external memory The data in it can only be accessed and processed by the central processor after it is first transferred into the memory.
When the content in the internal memory is to be read and written, the memory address from the address bus is decoded by the address decoder, and the designated storage unit is selected, and the read and write control circuit is based on the read and write Commands implement access operations to the memory, and the data bus is used to transmit information written to or read from the internal memory.
RAM is also called random access memory, which is the English abbreviation of Random Access Memory. RAM stores currently used programs, data, intermediate results, and data exchanged with external memory. The CPU can directly read or write the contents of RAM as needed.
ROM: It can only read operations but not write operations. It means Read Only Memory.
Extended content:
1, CD-ROM
CD-ROM (Compact Disc Read-Only Memory) is a CD-ROM used on computers. This kind of optical disc can only write data once, the information will be permanently stored on the optical disc, and the information will be read out by the optical disc drive when used. The CD format was originally designed for music storage and playback. In 1985, the Yellow Book standard developed by SONY and Philips enabled this format to adapt to various binary data. Some CD-ROMs store both music and computer data. The music on such CD-ROMs can be played by a CD player, but the computer data can only be processed by the computer.
2. Internal memory
Internal memory is one of the important components in the computer. It is a bridge for communication with the CPU. All programs in the computer are executed in the internal memory, so the performance of the internal memory has a great impact on the computer. Internal memory (Memory) is also called memory. Its function is to temporarily store operation data in the CPU and exchange data with external memories such as hard disks. As long as the computer is running, the CPU will transfer the data that needs to be calculated into the memory for calculation. When the calculation is completed, the CPU will send the results out. The operation of the memory also determines the stable operation of the computer. Memory is composed of memory chips, circuit boards, gold fingers and other parts.
3. Hard drive
The hard drive is one of the main storage media of the computer and consists of one or more aluminum or glass discs. The disc is covered with ferromagnetic material.
Hard drives include solid state drives (SSD drives, new hard drives), mechanical hard drives (HDD traditional hard drives), and hybrid hard drives (HHD, a new hard drive based on traditional mechanical hard drives). SSD uses flash memory particles for storage, HDD uses magnetic discs for storage, and hybrid hard disk (HHD: Hybrid Hard Disk) is a hard disk that integrates magnetic hard disk and flash memory. The vast majority of hard drives are fixed hard drives, permanently sealed and secured within the hard drive.
4. Cache memory
The original meaning of cache memory (Cache) is that the access speed is faster than that of general random access memory (RAM) A kind of RAM, generally speaking, it does not use DRAM technology like the system's main memory, but uses expensive but faster SRAM technology, also known as cache memory.
Cache memory is a first-level memory that exists between the main memory and the CPU. It is composed of a static memory chip (SRAM). The capacity is relatively small but the speed is much higher than the main memory, close to the speed of the CPU. In the hierarchy of computer storage systems, it is a high-speed, small-capacity memory between the central processing unit and the main memory. Together with the main memory, it forms a first-level memory. Scheduling and transfer of information between cache and main memory is automated by hardware. The most important technical indicator of cache memory is its hit rate.
For more related knowledge, please visit theFAQcolumn!
The above is the detailed content of Which memory has the fastest access speed?. For more information, please follow other related articles on the PHP Chinese website!