Flash memory equipment, and method and system for managing storage blocks in same

Abstract

The invention relates to a method for managing storage blocks in flash memory equipment, which comprises the following steps of: setting an error bit number threshold value, wherein the error bit number threshold value is smaller than the maximum error correcting capability of an error correcting code (ECC) of the flash memory equipment; comparing the error bit number of the current storage block with the error bit number threshold value when reading data; and if the error bit number of the current storage block is more than the error bit number threshold value, selecting a block to replace the current storage block from backup blocks of a flash memory. By the method, the error rate of the flash memory equipment can be reduced, so that the service life of the flash memory equipment is prolonged. In addition, the invention provides the flash memory equipment and a system for managing the storage blocks in the flash memory equipment.

Description

【Technical field】 [0001] The invention relates to the field of semiconductor storage, in particular to a flash memory device, a method and a system for managing storage blocks in the flash memory device. 【Background technique】 [0002] Flash memory is a non-volatile semiconductor memory chip, which has the advantages of small size, low power consumption, and insusceptibility to physical damage. It is an ideal storage medium for existing portable storage devices. However, as the usage time of the flash memory device prolongs, the storage block (Block) used to store data in the flash memory will gradually become unstable and error-prone. [0003] Generally, in a flash memory device, a control unit for controlling the flash memory has an ECC (Error Checking and Correcting, error detection and correction) error correction capability. The ECC error correction capability is used to correct data errors when a small number of bit errors occur in the flash memory. The maximum numbe...

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Problems solved by technology

[0005] However, the traditional method for managing storage blocks in this flash memory device is to replace them with bad blocks when ECC error correction fails. Therefore, when the bad blocks are replaced, the data has already been wrong, and this replacement can only prevent the data from being copied next time. No more errors, and if the location of the error is located in the storage area where the file system data or other key information is located, it may cause the entire flash memory device to be unusable, thereby reducing the service life of the flash memory device

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