Flash memory data control method and system

Abstract

The invention provides a flash memory data control method and system. The control method includes the following steps that the logical block number and deviation number of pages in a block are obtained according to logic page number of read / write data; whether a corresponding first physical block number exists or not is judged according to the logical block number and a first preset mapping table, and if not, a blank physical block is searched for to carry out operation of data writing or read finishing; if yes, physical page tables in the first physical block number are sequentially read to determine whether the physical page corresponding to the deviation number of the pages in the block exists or not, and if yes, data writing or reading is carried out on the corresponding physical page; if not, whether a corresponding second physical block number exists or not is determined according to the first physical block number and a second preset mapping table, and if yes, physical page tables of the second physical block number are sequentially read to determine whether the physical page corresponding to the deviation number of the pages in the block exists in the second physical block number or not.

Description

technical field [0001] The invention relates to the field of storage technologies, in particular to a method and system for controlling flash memory data. Background technique [0002] SSD (Solid State Disk) generally refers to a solid-state hard disk composed of NAND flash memory (Flash). Its special feature is that it has no mechanical structure and uses traditional NAND Flash characteristics to read and write functions in the form of block writing and erasing. , so the efficiency of reading and writing is very dependent on the design of reading and writing technology. Compared with the current traditional hard disk, SSD has the advantages of low power consumption, shock resistance, high stability, and low temperature resistance. Since the data on the SSD is stored on the semiconductor memory, it can complete the I / O (input / output) operation on the storage unit at any location in less than one millisecond, so it is the most critical I / O for many applications. O performan...

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Problems solved by technology

[0005] The present invention aims to solve the technical problems of low storage space utilization and waste of storage space in the prior art, and provides a flash memory that can effectively use storage space to reduce space waste, reduce the number of erasures of physical blocks, and reduce garbage collection. Control method and control system of flash memory data of times

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