Weak programming area management-based QLC solid state disk garbage collection method and system

Abstract

The invention relates to a QLC solid state disk garbage collection method and system based on weak programming area management, and the method comprises the steps that a Block log table is maintained in a firmware layer of a solid state disk, the Block log table is used for recording a single programming page generated due to data refreshing operation, and the Block log table is used for storing the single programming page in the firmware layer of the solid state disk; the Block log table records a physical block address and a page address range of a single programming page; when a candidate block for garbage collection needs to be selected, identifying and counting the number of pages belonging to single programming in the candidate block based on a Block log table to obtain the number of target pages; when the number of the target pages meets a preset condition, moving effective data, which do not belong to the single programming page, in the candidate block to the target block; and after all the valid data in the candidate blocks are migrated, performing an erasure operation on the candidate blocks. According to the method, the QLC solid state disk garbage collection efficiency is improved.

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