Method, device, computer equipment and storage medium for realizing erasing before writing

Abstract

The invention relates to a method, a device, a computer device and a storage medium for realizing erasing before writing. The method includes writing the factory bad block table and firmware into the NAND Flash during SMT; recording the writing point and related information; according to the recorded The writing point and related information perform data erasing before writing. The present invention writes the factory bad block table and firmware into NAND Flash during SMT, sets the premise requirement of erasing before writing, and does not perform a full disk erasing operation; records the writing point when writing data, and writes according to the write point when shutting down. The entry point uses the fast fill command, the data is moved to the SLC area, and the pre-write operation of filling the counterfeit data is used. During the use of the SSD, the erase before write operation is judged by the time threshold to ensure that the erase unit of the SSD will not be kept for a long time. Erase state, to avoid the phenomenon of increased write amplification, shortened life of NAND flash, and reduced life of SSD.

Description

Technical field [0001] The present invention relates to a solid state hard disk, and more particularly to a method, apparatus, computer device, and storage medium that implements a write-to-write erase. Background technique [0002] Due to the inherent characteristics of NAND Flash, erasure needs to be erased before writing, and cannot be done. And the latest SanDisk Nand Flash is the need to be erased only if you need to write, and the NAND FLASH is not allowed to keep the erase state, or some of the read-write units in the erasing unit remain erased in the erase state, wipe In addition to the unit length, the current SSD (Solid State Drive, Solid State Disk "implementation strategy is a full-scale erase when the SSD is shipped, and when the customer is actually used, the write operation is performed. This must cause the erase unit in the SSD to be erased or open, and seriously affect the SSD service life. [0003] In order to ensure multi-parallel operation, the method of multi...

AI Technical Summary

Problems solved by technology

The current FTL does not consider the erase-before-write feature of Sandisk 3D TLC particles, so the issue of open erase units and erased erase units will not be considered during the SSD read-write process and safe shutdown process, which will shorten the service life of the SSD. decrease

[0005] Therefore, it is necessary to design a new method to ensure that the erasing unit of the SSD will not remain in the erasing state for a long time, so as to avoid the phenomenon of increasing write amplification, shortening the life of NAND flash, and reducing the life of SSD.

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