Is a USB flash drive an external memory? A hard disk in a computer is not counted as external memory

Neither a ROM nor a RAM

The ROM is read-only memory, the information cannot be changed, and the content will not be lost when the power is off. For example, BIOSRAM is a random access memory, the content can be changed at will, and the read and write speed is very fast, but the stored content is lost when the power is off. For example, memory.

USB flash drive is an external memory and is a flash storage device.

No, the hard drive in a computer is internal storage.

Hard disk is one of the main storage media of a computer, consisting of one or more aluminum or glass discs. The disc is covered with a ferromagnetic material. Hard disks include solid state drives (SSD disks, modern hard drives), mechanical hard disks (HDDs), and hybrid hard disks.

HHD - Block is a new hard drive based on the traditional mechanical hard disk).

The function of the hard disk is to store and read data, for example, when you run a game program, it is to read the data in the disk frequently, and the reading of data is related to the speed of the hard disk. So the hard disk functions as an internal memory in the computer to run.

This is a conceptual answer, if a computer is used as a device, then the hard disk is not external memory. But the professional answer is that the hard disk is only a part of the computer and can be missing, and the hard disk is used as external memory. Internal and external memory needs to have a reference.

1. The hard disk is the memory. 2. There must be a reference, if a whole computer is used as a reference, the hard disk is the internal memory. 3. Because of the CPU, there is also memory in the memory, if the CPU is used as a reference, the hard disk is an external memory.

Hard disk does not count, hard disk is a part of the computer belongs to one of the three major parts, external memory refers to U disk, mobile hard disk, memory card.

No, external memory refers to the memory modules inserted in the computer.

Hard disks and optical discs, etc., are all examples of external memory.

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.

Hard disks are external storage.

Hard disk drive (HDD) is a non-volatile storage device based on a hard rotating platter on a computer, which stores and retrieves digital data on a flat magnetic surface, and the information is written to the disk by the electromagnetic current through the magnetic head very close to the magnetic surface, and the electromagnetic current changes the polarity by the electromagnetic current, and the information can be read in the opposite way, for example, when the reading head passes over the top of the recorded data, the magnetic field causes the electrical signal in the coil to change. The hard disk reads and writes by random access, so the data in the hard disk can be read in any order [2].

A hard disk consists of one or several disks that rotate at high speed and a head that is placed on the actuator cantilever.

Early hard disk storage media were replaceable, but today's typical hard drives use a fixed storage medium with the disc and head encapsulated in the body (except for a filtered air hole to balance out the air pressure difference caused by the heat generated during operation).

Hard disks were introduced by IBM in 1956[3] and became the main secondary storage device in general-purpose computers in the early 1960s, and with the advancement of technology, hard disks have also become the main components of servers and personal computers.

HDDs are broadly divided into ATA (IDE) and SATA as well as SCSI and SAS according to different data interfaces. The interface speed is not the actual hard disk data transfer speed, and the actual data transfer speed of the hard disk that is not based on flash memory technology generally does not exceed 300MB s.

Hard drive manufacturer.

Western Digital

IBM: The hard disk division was acquired by Hitachi in 2003.

Hitachi Global Storage Technologies: Acquired by Western Digital in 2011.

Seagate

Quantum: The hard disk division was acquired by Maxtor in 2000.

Conner: Acquired by Seagate in 1996.

Maxtor: Acquired by Seagate in 2006.

Samsung Electronics: The hard disk drive business was acquired by Seagate in 2013.

Toshiba (toshiba).

Fujitsu: On February 18, 2009, the hard disk division was acquired by Toshiba.

Excelstor

7 in the computer accessories diagram is the location of the hard disk.

No, the hard drive in a computer is internal storage. Hard disk is one of the main storage media of a computer, which is composed of one or more aluminum or glass discs. The disc is covered with a ferromagnetic material.

Hard disks are external memory. The differences are as follows: Refers to different external memory collapses: external memory refers to storage other than computer memory and CPU cache, which can still hold data after power failure.

Not why, it's the external memory. Specifically, memory refers to the CMOS of the motherboard and the memory in the sense of ordinary regrets. External memory is hard disk, optical drive, floppy drive, mobile storage and other devices.