In computers, what is the memory with the slowest access speed by the CPU?

In computers, the memory with the slowest CPU access speed is the "hard disk"; the order of CPU access speed is "CPU cache > memory > hard disk". The hard disk is one of the main storage media of the computer. It is composed of one or more aluminum or glass discs, and the discs are covered with ferromagnetic materials. Data is not lost even after the hard drive is powered off.

The operating environment of this tutorial: Windows 7 system, Dell G3 computer.

Usually the storage media of a computer system include Cache, memory, tape and hard disk, among which the "hard disk" has the slowest access speed.

The order of CPU access speed is: CPU cache>memory>hard disk. Accessing the cache is the fastest and accessing the hard disk is the slowest.

The hard disk is the main storage device of the computer. The hard disk (called hard disk in Hong Kong and Taiwan, English name: Hard Disk Drive, HDD for short, full name Winchester hard drive) is composed of one or more aluminum or glass discs. These discs are covered with ferromagnetic material.

Most hard drives are fixed hard drives, which are permanently sealed and fixed in the hard drive. Early hard drive storage media were replaceable, but today's typical hard drives are fixed storage media that are sealed within the hard drive (except for a filter hole to equalize air pressure). With the development, removable hard disks have also appeared, and they are becoming more and more popular, and there are more and more types. The hard disks installed on most microcomputers are called "winchester" technology because they adopt Winchester technology. "Chester hard drive", or simply "warm drive".

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