Method, device and computer equipment for improving read retry efficiency after ssd power failure

Abstract

The present invention relates to a method, device and computer equipment for improving read retry efficiency after SSD is powered off. The method includes storing a retry level table in a Nor flash memory; acquiring the retry level table in the Nor flash memory; and using the acquired retry level table The level table is updated to the retry level table of the dynamic random access memory; the valid retry level value is obtained; the retry level table information is updated, and the updated retry level table information is saved in the Nor flash memory. By implementing the method of the embodiment of the present invention, after the solid-state hard disk is powered off, the retry level table still has the valid retry level value before the power-off, and it is not necessary to traverse all the retry levels in order, so as to improve the power-off of the SSD. The efficiency of read retry on power cycle improves the read performance of SSD.

Description

technical field [0001] The present invention relates to a read retry method of a solid-state hard disk, and more specifically refers to a method, a device and a computer device for improving the read retry efficiency of an SSD after a power failure. Background technique [0002] Due to the physical characteristics of Nand flash memory particles, after repeated read, write and erase operations, the possibility of reading errors will become higher and higher. The practice of solid-state hard drives for this scenario is to perform read retry, and set different retry levels each time to read the read voltage and try to read until the read is successful or all levels of reading fail. [0003] As the number of reads and writes of the solid state disk increases, the level value of successful read retries of the same read and write unit will also change. In order to improve the efficiency of read retry, a common practice is to save the position of the read and write unit and the co...

AI Technical Summary

Problems solved by technology

After the read operation enters the read retry process, since the values ​​in the retry level table are all invalid, you can only traverse the retry levels in the default order for reading. When the read retry fails, use the next retry level value Retry to read until the read is successful or the traversal ends and the read retry fails. In this way, more useless level value reading is often used before the read is successful, resulting in low read retry efficiency and low read performance. And the reading performance will be low until it is re-established, and the hard disk reading speed is very slow

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