Self-adaptive data refreshing method for ensuring data continuity in solid state disk

A solid-state hard drive, self-adaptive technology, applied in electrical digital data processing, memory address/allocation/relocation, instruments, etc., can solve the problems of wasting flash memory erasing times, reducing the performance of solid-state hard drives, data loss, etc.
CN107748722AActive Publication Date: 2018-03-02HUAZHONG UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
HUAZHONG UNIV OF SCI & TECH
Publication Date
2018-03-02

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Abstract

The invention discloses a self-adaptive data refreshing method for ensuring data continuity in a solid state disk, and belongs to the technical field of solid state disk storage. The method comprisesthe steps of classifying flash pages according to a bit error number of the flash pages, setting retention time of the flash pages, and according to a quantity of the flash pages in a flash block, estimating an actual value T of data reliable retention time of the flash block; and according to a class which a flash page belongs to, after the retention time of the flash page reaches T, delaying a period of the retention time corresponding to the flash page and refreshing the flash page. The data reliable retention time can be estimated automatically according to the bit error condition of the solid state disk, and the time when the refreshing operations by different types of flash pages are initiated is determined; and the time when the refreshing operations by the different types of the flash pages are initiated is different, so that the performance degradation caused by refreshing of excessive pages in the same time is avoided, the flash page refreshing frequency can be reduced, and the service life of a flash is prolonged.
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Description

technical field

[0001] The invention belongs to the technical field of solid-state hard disk storage, and more specifically relates to an adaptive data refresh method for ensuring data integrity in a solid-state hard disk. Background technique

[0002] Flash-based SSD storage technology has the advantages of high throughput, low latency and low power consumption compared with traditional disk storage, so it has been widely used in various types of computers. In recent years, in order to reduce the price of SSDs, manufacturers have successively developed a flash memory technology with high storage density - Multi-Level Cell (MLC). MLC technology achieves the purpose of doubling the storage capacity by storing two or more bits of information in one flash memory unit. However, the introduction of MLC technology also brings about a problem, that is, the reliable continuous storage time (retention time, RT) of data in the flash memory after writing is relatively short, in other ...

Claims

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