Solid state drive and data access method applied to solid state drive

Abstract

The invention discloses a solid state drive and a data access method applied to the solid state drive. The data access method includes caching acquired to-be-written data in a preset write cache module; sorting the to-be-written data in the write cache module according to least recently used (LRU) page algorithms; determining preset quantities of replacement data among the not commonly used to-be-written data according to preset cache replacement algorithms when data memory spaces in the write cache module reach preset values; writing the replacement data in a flash memory of the solid state drive. The solid state drive and the data access method in an embodiment of the invention have the advantages that the rewriting frequencies of the flash memory in the solid state drive can be effectively reduced, and the problem of writing amplification of an existing solid state drive in data access procedures can be effectively solved.

Description

technical field [0001] The invention relates to the field of computers, in particular to a solid-state hard disk and a data access method applied to the solid-state hard disk. Background technique [0002] Solid State Drives (SSD, Solid State Drives) are hard disks made of solid-state electronic memory chip arrays. Solid State Drives include a control unit and a storage unit (usually a FLASH memory chip). [0003] The storage unit widely used in solid-state hard drives is generally NAND flash memory, which cannot directly perform overwriting operations on the location where the original data is stored; the specific reasons are, first of all, the NAND flash memory The byte can only change from 1 to 0, and vice versa; in addition, for the write operation of the solid state disk, its smallest operation unit is the page; based on the above two characteristics, all write operations need to be performed in one All bytes are all 1 on the new page, so by changing the byte that need...

AI Technical Summary

Problems solved by technology

[0008] For applications with active data pages such as online transactions, big data applications, and enterprise systems, the SSDs used still have the problem of write amplification, that is, the storage performance of SSDs is low, and SSDs The problem of too short service life

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