What is disk fragmentation and how is it formed?

Disk defragmentation, for example, in rooms, corridors, there is too much junk stuff. It is difficult to walk.

The files on the disk are arranged according to the storage time, and so on, and theoretically the files are arranged compactly without gaps.

However, we tend to make changes to the file, so that the new content is not added directly to the location of the original file, but is placed at the very end of the disk storage, and the system will add a link between the two segments.

When multiple files are modified, there will be a lot of discontinuous files on the disk.

Once a file is deleted, the discrete space occupied will be empty and will not be automatically filled, and the newly saved files will not be placed in these places, and these empty disk spaces are called "disk fragmentation".

As we all know, there will be fragments in every partition of the hard drive.

There are too many fragments, and there are many other discontinuous files, and the system will repeatedly search for contact documents when performing file operations, which greatly reduces the efficiency, and the direct reflection is that it feels slow!

Knowing the basics of disk fragmentation, I think you should know how to solve it.

Generally, in all versions of the Windows system, there is a "disk defragmenter", all under "programs", "accessories", "system tools", when executing this command, the hard disk will perform a large number of read and write operations, put a large number of scattered files at the end of the disk, and then write to the files associated with it, and finally, there are basically no scattered files in the disk, so that the running speed of the system will be significantly improved!

So, the remaining space of each disk cannot be less than 15%, otherwise, defragmentation cannot be carried out!

However, we also know that the impact of disk defragmentation on hard disks is quite large, and it is the most frequent hard disk read and write operations!

So, is it necessary to declutter the hard drive? Take the XP system as an example, its defragmenter has an "analyze" function, analyze it, it will give you a report, if it prompts: the disk needs to be organized, then, it really needs to be organized.

Finally, about disk defragmentation software, there are a lot of non-windows that come with it, all of which are claimed to be fast and effective, and the famous vopt is one, but, in fact, vopt and other defragmentation software is not really physically organized on the disk, just add some hyperlinks, after it is organized, the speed may be fast on the surface, but soon, it will return to the original chaotic state. If VPP is good, why doesn't Microsoft integrate it into the new version?

Therefore, the best disk defragmentation software, which comes with Windows, is a physical defragmentation operation on the disk in the real sense, so when it runs, it is very slow, usually for several hours.

Moreover, when defragmenting, do not run any programs, and it is better to close all programs that run automatically and reside in memory, turn off screen savers, etc., otherwise, it will cause the defragmentation to be unusually slow, or even start again.

What is disk fragmentation? 】

In fact, disk fragmentation should be called file fragmentation because files are scattered and stored in different places throughout the disk, rather than being continuously stored in continuous clusters of disks.

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When the physical memory required by the application is insufficient, the general operating system will generate a temporary swap file in the hard disk, and use the hard disk space occupied by the file to virtualize the memory. The virtual memory manager will frequently read and write to the hard disk, resulting in a large amount of fragmentation, which is the main reason for the fragmentation of the hard disk.

Others, such as temporary files generated by Internet Explorer when browsing information or the setting of temporary file directories, will also cause a large number of fragments to form in the system. File fragmentation generally does not cause problems in the system, but too many file fragments will cause the system to look back and forth when reading files, causing system performance degradation and serious shortening of hard disk life. In addition, excessive disk fragmentation can lead to the loss of stored files.

How does disk fragmentation occur? 】

In addition, during file operations, the Windows system may call virtual memory to synchronize the hypervisor, which will cause each program to frequently read and write to the hard disk, resulting in disk fragmentation.

There is also a situation that when the content of a sector in the middle is deleted, a new smaller file is written, so that there will be some space on both sides of the file, and then a file is written, and any part of the two sections of space cannot accommodate the file, so the file needs to be divided into two parts, and the fragments are generated again.

The most common is a large file such as a movie, during which half of everyone will deal with other things, and the movie file is forced to be divided into several fragments and stored on the hard disk. Therefore, ** is an important source of debris. In addition, if the file space is not large enough, a large number of disk fragments will be generated, and this situation will become more and more serious with the frequent deletion and modification of files.

Although disk fragmentation does not have a significant impact on normal operation, it can significantly reduce the operation speed of the hard disk, mainly because the hard disk needs to jump between multiple fragments to read files, which increases the latency of waiting for the platter to rotate to the specified sector and the seek time required for the head to switch tracks.

The system is taking a long time. Hard drives will have it. You can organize it in the tool