Why SSD don't need to defragment ?

In the process of the hard disk fragments refers to the hard disk read and write files of discontinuity.

Due to the file partition table when the contents of a file into the hard disk is not deposited in a row, so that after the delete this file, some space not release that cause the generation of debris.When required for the application of physical memory, the general operating system can result in a temporary swap file on the hard disk, virtual hard disk space occupied by the file into memory.Virtual memory management program may read and write to the hard disk frequently, produce a lot of pieces, this is the principal causes of hard disk fragments.

One of the most common causes of fragments is to download large files, because the large file download was forced to split into several fragments stored in hard disk.So the download is one of the important reasons for debris.Also delete files regularly, and will produce large amounts of disk fragments, the more frequently the revised file, the more pieces.A file on disk fragments, the system of a new file to read and the more slowly.This is mainly due to the hard disk read a file need to jump between multiple pieces, increasing the incubation period of waiting for the disc rotate to the specified sector and head to switch to seek time required to track.

Disk defragmenter is the main principle, will be scattered data on hard disk and orderly, to reduce the addressing time and improve the access speed of disk, timely cleaning disk fragments file also helps to keep the health of the hard disk.

Disk defragmenter method are many, can through the WINDOWS own defragmentation tool, also can use third-party defragmentation software (such as: the efficiency of source data security center). Defragmentation is mainly suitable for HDD, of course, and the solid-state drives are no defragmentation.Because of the SSD storage compared with the traditional mechanical hard disk is has essential difference.In order to prevent frequent reading and writing a memory cell to Flash ageing, SSD internal are adopted "wear-leveling mechanism about reading and writing" average number of each block.No head for the SSD drive mechanism, the principle of its electronic reading and writing can quickly find any data.Therefore the defragment for SSD has little effect.Life is limited, in addition because the SSD with, speaking, reading and writing on the hard disk of the disk defragmenter frequently wipe, will affect the life of the SSD