Solid state disk data reading and writing method and solid state disk

Abstract

The invention provides a solid state disk data reading and writing method and a solid state disk. The method comprises the steps that an event reading request including a logic block address of target data is received; a physical block address corresponding to the logic block address in a Flash medium is looked up; the difference value of a current physical block address and the physical block address is calculated; if the difference value is greater than the number of instable physical pages in the Flash medium, the target data is read from the Flash medium based on the physical block address; if the difference value is not greater than the number of the instable physical pages in the Flash medium, the target data is read from a cache based on the physical block address, wherein data in the instable physical pages is backed up in the cache. The data reading accuracy is improved on the basis that the handling difficulty in the reading process is not increased.

Description

technical field [0001] The present application relates to the technical field of solid-state hard disks, and in particular to a data reading and writing method of a solid-state hard disk and a solid-state hard disk. Background technique [0002] The solid state hard disk includes a control unit and a solid state storage unit, and the solid state storage unit mostly adopts Flash media. Due to the hardware problem of the Flash medium itself, the data newly written in the physical page in the Flash medium is usually unstable. Therefore, when reading a newly written physical page in the Flash medium, read errors are prone to occur. [0003] At present, in order to prevent reading errors, complex error correction algorithms are often used. However, because the error correction ability of error correction algorithms is difficult to guarantee, when using error correction algorithms to read data, it not only increases the processing difficulty of the reading process, but also makes...

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Problems solved by technology

Therefore, when reading a newly written physical page in the Flash medium, read errors are prone to occur

[0003] At present, in order to prevent reading errors, complex error correction algorithms are often used. However, because the error correction ability of error correction algorithms is difficult to guarantee, when using error correction algorithms to read data, it not only increases the processing difficulty of the reading process, but also makes the accuracy difficult. ensure

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