HMB-based logic physical mapping table protection method and device and solid state disk

Abstract

The invention discloses an HMB-based logic physical mapping table protection method and device and a solid state disk. The method comprises the following steps of: storing a logic physical mapping table: generating CRC (Cyclic Redundancy Check) check data for the logic physical mapping table stored in a host memory buffer; storing the CRC check data and the logical physical mapping table in a hostmemory buffer in an associated manner; a logic physical mapping table reading process: calling a logic physical mapping table stored in a host memory buffer, and carrying out CRC check on the logic physical mapping table; and when the verification is passed, judging that the obtained logic physical mapping table is credible data. According to the scheme, the CRC data is generated for the logicaland physical mapping table stored in the memory buffer of the host; CRC check data and the logical and physical mapping table are stored in a host memory buffer in an associated mode, the accuracy ofthe logical and physical mapping table stored in the host is ensured, and the situation that user data are disordered due to the fact that wrong logical and physical mapping table information is readand points to wrong physical addresses is avoided.

Description

technical field [0001] The invention relates to the field of solid-state hard disks, in particular to an HMB-based logical-physical mapping table protection method, device and solid-state hard disk. Background technique [0002] SSD, the English full name is Solid State Drive, the Chinese name is solid state drive or solid state hard disk, solid state hard disk is a hard disk made of solid state electronic memory chip array, because the solid capacitor is called Solid in Taiwan, China. SSD is composed of control unit and storage unit (FLASH chip, DRAM chip). [0003] HMB, the English full name is Host Memory Buffer, and the Chinese name is Host Memory Buffer. As the name suggests, it provides a mechanism to enable SSD to use the free memory space on the Host side through the NVMe protocol. This memory space can replace DRAM and be used for L2P table access on the Device side, speeding up performance and saving costs. However, the L2P table is stored in the host memory, and...

AI Technical Summary

Problems solved by technology

However, the L2P table is stored in the host memory, and the SSD cannot fully trust the integrity of the data, which is not conducive to data writing and reading

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