A kind of solid state disk and its read and write operation method

Abstract

The invention discloses a solid-state disk and a reading and writing operation method thereof. The solid-state disk includes a solid-state disk controller, n+1 channels, m SLC flash memory chips and m×n MLC flash memory chips, where m and n are both positive integers; m SLC flash memory chips are set in n+1 channels On one of the channels, m×n MLC flash memory chips are set on the remaining n channels of the n+1 channels, and each of the remaining n channels has m MLC flash memory chips; SLC flash memory chips The storage capacity of the MLC flash memory chip is small for storing verification data, and the storage capacity of the MLC flash memory chip is large for storing user data. The SLC flash memory chip and the MLC flash memory chip perform data transmission through the channel where they are located. The invention can effectively improve the service life of the solid state disk and reduce the cost of the storage system.

Description

technical field [0001] The invention belongs to the technical field of computer storage, and more specifically relates to a solid-state disk and a read-write operation method thereof. Background technique [0002] Compared with traditional magnetic disks, solid-state disks based on flash memory chips have the advantages of high read and write speeds, low energy consumption, and shock resistance. In order to improve the capacity density of solid-state disks, multi-level cell (Multi-Level Cell, MLC) technology, that is, store two or more bits of information in one storage unit, is widely used in solid-state disks; at the same time, the process of solid-state disks Dimensions are continuing to shrink, which will lead to a decrease in the service life of SSDs. [0003] The lifespan of an SSD is primarily limited by its underlying structure. The memory cell of flash memory contains an oxide layer that can store electrons, showing different charge states according to the number ...

AI Technical Summary

Problems solved by technology

The erasing and writing operation of the solid-state disk will wear out the oxide layer, causing electrons to escape from the oxide layer, resulting in an increase in the original bit error rate of the solid-state disk

When the raw bit error rate rises and the data reliability of the SSD cannot be guaranteed, the life of the SSD is exhausted

SSDs based on MLC flash memory chips have a higher raw bit error rate due to storing more bits of information in one memory cell, resulting in a shorter lifespan

At present, the industry improves the data reliability of solid-state disks by strengthening the in-page ECC verification capability, thereby prolonging the service life of solid-state disks, but at the same time it will increase the decoding delay of solid-state disks, and is limited by the number of bits in the spare area. length

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