A method of preventing data loss from a solid state drive

Abstract

The invention particularly relates to a method for preventing data loss of a solid-state hard disk. The data required to be written into a plurality of coupled physical pages in the solid-state hard disk are respectively written into a corresponding plurality of coupled physical pages by adopting a matrix cross-writing mode. Matrix cross-writing is used to ensure that the coupling pages of all pages in each independent redundant disk array protection aggregation area are always in the different redundant disk array protection aggregation area. At most one intersection point between that couplepages of all page in each set of independent redundant disk array protection areas and all sets of independent redundant disk array protection area to which the coupled pages belong. The invention can realize multiple coupling low page data loss caused by abnormal power-down of the solid-state hard disk; Or a plurality of coupled low-page data loss errors caused by a normal plurality of page write errors are corrected and recovered without cost; A maximum effective bandwidth of that whole channel can be adopt when writing the solid-state disk, the efficiency of write data is improved, the data loss of the solid-state disk is prevented, and the performance of the solid-state disk is improved.

Description

technical field [0001] The present invention relates to the technical field of storage, and in particular, to a method for preventing data loss of a solid-state hard disk. Background technique [0002] The development of NAND Flash (memory) is tending to have higher density, so in addition to the continuous updating of the process, each Cell will also have more bits, that is, MLC (Multi-Level Cell). However, due to the inherent technical characteristics of MLCFlash, data loss due to accidental power failure has always been the most difficult and serious problem in the development of SSD (Solid State Disk, solid state drive) technology. Especially in enterprise-level products, such errors are often unacceptable. [0003] Inside the MLC, each cell unit can represent multiple bit values ​​(common value is 2), and these multiple bit values ​​belong to multiple pages in a block. That is, multiple pages actually share a set of physical cell units. The relationship between a set...

AI Technical Summary

Problems solved by technology

There are three major problems in the first solution: First, due to its inherent attenuation characteristics, the capacitance of the large capacitor will drop sharply after a certain period of use, and may even be less than 1 / 5 of the initial value

The second solution also has a problem: Although this solution can solve all the above problems, the disadvantage is that the backup and the original value are written at the same time, which directly causes the write performance to be compromised, and the write amplification increases, which shortens the life of the SSD.

[0008] In summary, the existing technology for preventing data loss obviously has inconvenience and defects in actual use, so it is necessary to improve it

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