Solid state disk (SSD) double-area wear leveling processing method based on super block

Abstract

The invention discloses a solid state disk (SSD) wear leveling method based on a super block structure. The method is based on a super block structure of the solid state disk. The whole system is divided into double blocks (A and B); the super blocks (D) in the two areas are arranged in a cold and hot staggered manner; according to the method, a misplaced recovery mode (C) is adopted during garbage recovery, hot data of a super block is recovered into a cold data block (400) of another area according to a misplaced rule, and cold data is recovered into a hot data block (300) of another area, so that wear leveling treatment is completed without consuming extra read-write operation while garbage recovery is realized. On the basis of double-area wear leveling, the invention is also compatiblewith a method for processing excessive effective data during garbage collection by utilizing the standby block (700). On the whole, extra flash memory read-write overhead is reduced, and the effectsof improving the performance and prolonging the service life are achieved.

Description

technical field [0001] The invention relates to a superblock-based solid-state disk SSD dual-area wear leveling processing method, which belongs to the fields of electronic information and integrated circuit design. Background technique [0002] In 1967, Bell Labs' Korean scientist Jiang Dayuan and Chinese scientist Shi Min invented the floating gate transistor (Floating Gate Transistor), which laid the foundation for solid-state drive SSD technology. Compared with MOSFETs, floating gate transistors have more floating gates, that is, floating gate layers. This layer is wrapped with high-impedance materials and insulated from top to bottom, so that it can store charges and ensure that SSD data is not volatile. From the perspective of technical parameters, solid-state disk SSD has advantages such as good performance, low power consumption, and good shock and drop resistance compared with mechanical hard disk HDD, while HDD currently has a price advantage. However, with the rep...

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Problems solved by technology

[0015] In order to solve the phenomenon that under the existing super block architecture, the effect of the traditional wear leveling method is not obvious, and the resulting reading and writing amplification is too large and seriously affects the performance, the present invention provides a dual-zone solid-state hard disk SSD based on a super block wear leveling method

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