Why can't SSD solid state hard disk under Win7 system be defragmented with disk?

Disk Defragmentation is a Windows built-in tool for defragmenting storage devices such as hard disks. It reduces the accumulation of redundant files on the hard disk and speeds up the operation of the disk, thus improving the overall speed of the computer. So, can SSD SSDs be defragmented under Win7? Xiaobian reminds everyone, don't use it! why? Consider the following:

staking their claims to the solid-state drive, mechanical storage type weak decline of the moment, but disk defragmentation fade out of our vision, more people said that SSDs are they No need for disk defragmentation

So why doesn't SSDs need disk defragmentation?

Before you solve this problem, let's take a look at what is defragmentation.

Disk defragmentation, as the name suggests, is the use of system software or professional disk defragmentation software to reorganize the fragmentation and messy files generated by the computer disk during long-term use, which can improve the overall performance and speed of the computer.

Because files are scattered across different parts of the disk, rather than being continuously stored in contiguous clusters of disks, disk fragmentation occurs over time.

The reason why SSD does not need defragmentation

From the principle of disk fragmentation, it can be seen that the secret of defragmentation of PCs is to defragment disk fragments. Combine the fragment files into one, speeding up the seek time of the disk, thus accelerating the speed of the computer as a whole.

The charge seek time is almost zero

The storage unit of the solid state drive is based on the electronic storage of the flash memory particles, so the theoretical seek time is eternal, affecting Its performance depends on the performance of the master chip and the process of flash granules. This is why many players have suggested the first major reason for not needing defragmentation in the SSD era.

The number of SSD read and write times is precious

Second, the working mechanism of defragmentation is to re-read and store the files stored on the disk in a certain order. For a solid-state hard drive that treats the number of erasures as life, it is tantamount to self-destruction. The flash storage characteristics of SSDs determine that the number of erasures is limited. Once the quota is exceeded, the disk cannot be written as a disc. Therefore, defragmentation in the SSD era is a near-suicide behavior, which is the second biggest reason why players do not recommend defragmentation.

The advantages of STL with TRIM

The third is the TRIM function that comes with the SSD. When it is turned on, it can fully exert the overall read and write performance of the SSD. In a sense Said, in fact, has served as a defragmentation work.

Combining the above reasons, whether in principle or in reality, the value of disk defragmentation in the SSD era is really small, although from Win8 Microsoft has been targeting SSD features. The innovation of the related defragmentation function, but in terms of the flash memory characteristics of the current solid state drive, its role is also minimal.

In response to the above arguments, some netizens gave the following insights:

As early as Win8, disk components have not been called "disk defrag" & rdquo; “Optimize drive”, with both defragmentation HDD and solid-state pruning SSD, does not perform a lot of file movement and merging operations on SSD.

That is to say, even if you defragment SSD in Win8/Win10, the system will only make trim operation, which has been clearly pointed out in foreign professional forums such as superuser and Win10 forum. They even suggested that Win10 is more compatible with SSD than HDD. For some operations that damage the hard disk, it is more vulnerable to HDD than SSD.

In Win10, the biggest damage to the performance of the hard disk is not the file size of one read and write, but the number. Whether it is HDD SSD or U disk, if the number of files smaller than 20kb in an ntfs partition exceeds 100,000 (100,000), the 100,000 files will not be written together with files larger than 20k, and will be directly written. Master file table, join index, journal, and so on. Due to the limitations of ntfs, the extremely large number of small and small files read and write operations are extremely burdensome for the performance of mechanical and solid state drives. Most large-scale software (especially games with dozens of gigabytes) now packs fragmented resource files into one or several large files, minimizing the number of files and reducing the expansion of the main file table and usn journal. Even if you do this every time you run out of memory and CPU to perform the unpacking process, it is worthwhile relative to the performance bottleneck of the hard disk and the impact on life. The real killer of a hard disk is not the read and write operation itself, but a large amount of reading and writing of files smaller than 20 bytes.

In summary, the SSd SSD under Win7 system is best not to use disk defragmentation, because it is not necessary.