Intel’s official Weibo is here to popularize science again.

The question of this popular science is: "Many friends have found that SSD will become slower and slower with use. What is the reason?"

Intel's official Weibo said: "This is because some systems will defragment the SSD, and disk defragmentation will have a great impact on its durability."

Of course, there are more than just reasons why SSDs become slower as they are used.

First of all, the writing method of SSD means that it cannot directly overwrite data. A brand-new SSD can be written at will because there is no data before. However, after using it for a period of time, the SSD needs to be space reclaimed and erased before writing, which will cause the speed to change. Slow, which is why SSD is equipped with TRIM function.

Then there is the OP reserved space. The OP reserved space is used to control the operations of various optimization mechanisms, such as GC recycling, wear leveling, etc. The larger the space, the more guaranteed the performance of the SSD, but as user data becomes more and more When the SSD usage is close to full, the SSD will slow down due to insufficient reserved space.

Finally, there is the problem of overheating of the main control. Although the current manufacturing process of SSD flash memory and main control chips has rarely seen hot products. However, the main control chips used in some high-speed SSDs still generate relatively large amounts of heat when used at high speed for a long time. Like the CPU, the main control chip will automatically slow down when the temperature is too high. At this time, the read and write speed of the SSD will drop significantly.