Method, device and computer device for improving efficiency of read-retry after power-off of SSD

Abstract

The invention relates to a method, a device and a computer device for improving the efficiency of read-retry after power-off of an SSD. The method comprises: storing a retry level table in a Nor flashmemory; obtaining the retry level table in Nor flash memory; updating the retry level table to a retry level table of a dynamic random access memory using the obtained retry level table; getting a valid retry level value; Update the retry level table information and save the updated retry level table information to Nor Flash. By implementing the method of the embodiment of the invention, the effective retry level value before the power-off is still available in the retry level table after the power-off of the solid state hard disk, and all retry levels need not be traversed in sequence, so asto realize the improvement of the efficiency of reading and retrying after the power-off of the SSD and the improvement of the reading performance of the 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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