Is a USB flash drive an external memory? Is memory memory considered external memory?

The main differences between internal memory and external memory are:

1. The speed is different, the memory is at least 100 times faster than the external memory, the fastest external memory is the hard disk, and the slowest is the floppy disk.

2. The capacity is different, the memory capacity is generally a few G, the large one is 16G, 32G, etc., and the external memory, such as hard disk, is hundreds.

g, a couple of tg.

3. The volatility is different, if the memory is shut down and the power is off, all the data will be lost, while the external memory will not be affected, and the data will always be there.

The programs** and data required for CPU operation come from memory, and the things in memory come from the hard disk, so the hard disk does not directly deal with the CPU, and the hard disk is external memory relative to the memory.

Difference Between Inner Memory and Outer Memory:

1. In terms of speed, the internal memory is at least 100 times faster than the external memory.

2. The memory capacity is generally a few G, the large one is 16G, 32G, etc., and the external memory, such as hard disk, is just a few.

3. If the memory is shut down and powered off, all the data will be lost, and the external memory will not be affected, and the data will always be there.

How it works:

Memory is a memory component used to store programs and various data information. Memory can be divided into two categories: primary memory (referred to as primary memory or memory) and secondary memory (referred to as secondary memory or external memory). It is the main memory that exchanges information directly with the CPU.

The way of working of main memory is to store or read all kinds of information according to the address of the storage unit, which is collectively referred to as accessing memory. The carrier that gathers the memory cells in the main memory is called the storage body, and each unit in the memory body can store the information represented by a string of binary codes.

The total number of bits of this information is called the word length of a memory unit. The address of the storage unit corresponds to the information stored in it, and the unit address is only one, which is fixed, and the information stored in it can be replaced.

Generally, the memory is distinguished in this way, for example, the memory module on the computer refers to the space occupied by the system when the system is operating, and the external storage device generally stores files, such as songs, movies or documents, etc., such as hard disks, USB flash drives, all of which belong to external memory devices.

The internal memory can be encrypted and private, while the external memory can indeed be logged in on different machines.

External storage mainly includes disk storage, tape storage, and optical disk storage.

External memory is an external storage device, which is much slower than memory, but can save data for a long time, and disk is the most commonly used external memory, usually it is divided into two categories: floppy disk and hard disk. There are also CD-ROMs, flash drives, and more.

Because the role of internal and external memory is different. The internal memory is a temporary storage area when the program is executed, and all data is lost after power failure; The external memory is used to store the original data and calculation results, which needs to be stored for a long time, and the data will not be lost after power failure.

The most prominent feature of internal memory is that the access speed is fast, but the capacity is small and expensive; External memory is characterized by large capacity and low capacity, but slow access speed. Internal memory is used to store programs and data that are immediately needed; External memory is used to store programs and data that are not in use for the time being. There is often a frequent exchange of information between the inner and outer memory.

What is the difference between internal and external memory? The internal memory should be its own, called the internal memory, and the external memory should be external software or memory card.

A computer's memory can be divided into three categories: internal memory, external memory, and read-only memory.

The core of a computer is called the CPU, which is the fastest in a computer, and if the CPU reads data directly from the hard drive, then the computer will be very slow. However, the speed of the memory module is almost comparable to that of the CPU, so the memory module is used directly by the CPU, and the memory is also known as the main memory, which is the only component that can be used directly by the CPU. The data on the hard disk is first put into memory and then processed by the CPU, which can increase the running speed.

However, the capacity of the memory is small and quite costly, and all the data of the memory module is lost in the event of a power outage. Memory is the most important component, and if something happens to the memory module, the computer will run slowly, or it will have a blue screen of death.

Because the capacity of the memory module is very small and the cost is high, data is lost after a power outage. Therefore, external memory is used as an auxiliary use of memory modules, and external memory is also called auxiliary memory. The capacity of external memory is almost massive, up to hundreds of GB today, and it can store data permanently, and it will not be lost in power failure, so a large number of files are stored in external memory hard disks, and they are only transferred to memory when they are running.

Large-capacity hard drives are also cheaper than memory, but hard drives are quite slow, so they are only used as a secondary. However, its importance is still very high.

Read-only memory means that data can only be read out, but cannot be modified. It is used to store data that does not need to be modified for long-term use, such as before the system is running, as the most basic guide, or the working settings of the hardware.

The "main memory" structure was introduced to solve the problem of mismatch between the main memory and CPU speed. The "secondary memory" structure was introduced to solve the problem of insufficient main memory capacity. "Primary Memory" means adding a level of fast, but smaller, higher per bit cache storage between the CPU and Main Memory.

With the help of auxiliary software and hardware, it forms an organic whole with the main memory to make up for the lack of main memory speed.

The purpose of the "Main Memory" level is to make up for the lack of main memory capacity. It is the addition of a larger, lower per bit**, but slower memory (called secondary memory, usually a hard disk) to the main memory. They rely on the role of auxiliary software and hardware to form a whole.

The "main memory" and "secondary memory" levels are often used to implement virtual memory, providing a large amount of program space to the programmer.

Introduction to hard disks

Hard disks belong to external memory, mechanical hard disks are made of metal magnetic sheets or glass magnetic sheets, and magnetic sheets have memory functions, so the data stored on the magnetic sheets, whether they are turned on or off, will not be lost. The hard disk capacity is very large, it has reached the terabyte level, the size is inches, etc., and the interfaces are IDE, SATA, SCSI, etc., and SATA is the most common.

Portable hard disk is a storage product that uses hard disk as a storage medium and emphasizes portability. The vast majority of portable hard drives on the market are based on standard hard drives, and only a small number of them are based on micro hard drives, but the most important factors determine whether mainstream mobile hard drives are still based on standard notebook hard drives.

The above content refers to Encyclopedia-Computer.