Classification of memory, what three categories of memory can be divided into

Classification characteristics of memory and its application library.

Memory can be divided into more than just three categories. Because according to different classification methods, memory can be divided into different types. Common classifications are as follows.

1. Divided by storage medium.

1.Semiconductor memory: A memory composed of semiconductor devices.

2.Magnetic surface memory: A memory made of magnetic materials.

2. Divided according to the mode of storage.

1.RAM: The contents of any memory cell can be accessed randomly, regardless of the time of access and the physical location of the cell.

2.Sequential memory: It can only be accessed in a certain order, and the access time is related to the physical location of the storage unit.

3. Divided according to the reading and writing function.

1.Read-only memory (ROM): A pure return memory of semiconductor silver that is fixed and can only be read out but not written.

2.Random read-write memory (RAM): A memory that can be both read and written.

4. Divided according to the preservation of information.

1.Non-permanent memory: Memory that disappears when the power is off.

2.Permanent memory memory: A memory that can still hold information even after a power failure.

5. Divided by use.

1.Main memory: The main memory memory stores a large number of programs and data during the operation of the computer, and the access speed is relatively fast, and the storage capacity is not large.

2.External memory: external memory stores system programs and large data files and databases, with large storage capacity and low unit cost.

3.Cache: Cache is fast for high-speed access instructions and data, but has a small storage capacity.

Memory points: rom(Read-only memory) and ram (RAMor read-write memory).

According to von Neumann's definition, a computer consists only of: CPU, memory, input and output devices.

There is nothing "external memory."

hard drive, it's a computer again.

According to the form of storage: internal memory (temporary memory) and external memory (permanent memory) Internal memory can be divided into: ROM (read-only memory) and RAM (random memory or read-write memory) External memory can be divided into:

Disks (floppy disks, hard disks), optical discs (CD-R, CD-W, ***, etc.), data arrays (data backup machines).

Memory can be divided into which categories according to the use, the classification of memory one: according to the storage medium semiconductor memory: memory composed of semiconductor devices.

Magnetic surface memory: A memory made of magnetic materials. Classification of memory II:

RAM by storage mode: The contents of any memory cell can be accessed randomly, regardless of the time of access and the physical location of the storage cell. Sequential Memory:

It can only be accessed in a certain order, and the access time is related to the physical location of the storage unit. Classification of memory 3: Read-only memory (ROM) by read-write function:

The content of the delayed storage is a semiconductor memory that is fixed and can only be read out but not written. Random read-write memory (RAM): Semiconductor memory that can be read and written to as well as both.

Classification of memory 4: memory with non-permanent memory according to information preservation: storage of the first memory where the information disappears after power failure.

Permanent memory memory: A memory that can still hold information even after a power failure. Classification of memory five:

According to the role of memory in computer systems, it can be divided into main memory, auxiliary memory, buffer storage code bend, control memory, etc. In order to solve the contradiction between the requirements for memory, high capacity, fast speed, and low cost, a multi-level memory architecture is usually adopted, that is, buffer memory, main memory, and external memory are used.

Classification: The devices used to store information are called storage devices for computers, such as memory, hard disks, floppy disks, and optical discs. Memory is a storage device that is directly linked to the CPU, and the computing speed is fast and high.

Function: The hard disk is the main storage device of the microcomputer, which is characterized by large storage capacity, fast read and write speed, high reliability, and easy to use.

Features: Low cost, light weight, cheap, platters are easy to keep and carry, but slow to read and write. The main features of optical discs are large storage capacity and high reliability.

With memory, the computer has a memory function to ensure normal operation. The memory in a computer can be divided into primary memory (memory) and auxiliary memory (external memory) according to the purpose of memory, and there are also classification methods that divide it into external memory and internal memory. External memory is usually magnetic media or optical discs, etc., which can store information for a long time.

The storage part on the motherboard, which is used to store the data and programs that are currently being executed, but is only used to store programs and data temporarily, and the data will be lost when the power is turned off or the power is off.