Method for reading and writing private data to secure digital (SD) memory card

Abstract

The invention relates to a method for reading and writing private data to a secure digital (SD) memory card. The method comprises the steps that: private data reading and writing files are built in the SD memory card, addresses of the private data reading files are stored to a storage space of the SD memory card and are resident in the memory, and file allocation tables (FATs), catalogues and data regions of the private data reading and writing files are writable; when the private data is written, the SD memory card judges whether private data writing identifiers exist in SD standard writing commands or not, and if so, the private data writing operation is executed; when the private data is read, the SD memory card judges whether addresses of SD standard reading commands are matched with addresses of the self stored private data reading files or not, and if so, the private data reading operation is carried out. When the method for reading and writing private data to the SD memory card, the reading and the writing of the private data can also be realized after reading files built during SD memory card volume production are deleted or edited or the SD memory card is formatted.

Description

technical field [0001] The invention relates to the communication field, in particular to a method for reading and writing private data to an SD memory card. Background technique [0002] In the prior art, the SD memory card realizes reading and writing of private data through the following scheme: [0003] The first solution: The mass production tool creates a read-write file on the SD memory card. The address of the read-write file is a certain address or address range negotiated by the mass production tool and the SD memory card firmware. The SD memory card firmware and The addresses or address ranges of read-write files negotiated by mass production tools are recorded, but these addresses or address ranges cannot be updated. When reading private data, the SD memory card firmware will compare the address of the standard SD read command with the address recorded by the SD memory card firmware. If the address of the standard SD read command is equal to the address recorded...

AI Technical Summary

Problems solved by technology

[0006] To sum up, there are problems in the prior art schemes for reading and writing private data on SD memory cards: the read-write files created during mass production are not allowed to be deleted or formatted; or created during mass production After the read-write file is deleted, edited or the SD memory card is formatted, private data can no longer be read and written through the read-write file

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