High-reliability linear file access method based on nand flash

Abstract

The invention discloses a high-reliability linear file access method based on a nand flash. The nand flash comprises an sdram memory, an nvram nonvolatile memory and a nand flash memory array. The access method comprises the following steps: initializing a partition table; initializing file information which comprises beginning and end addresses of a file, an open mode, a filename and file size information; creating a new file according to initialized file information; adopting an address order mode to transfer data from a buffer area in the sdram memory of the nand flash to a memory area pointed by a file pointer in the partition area, and completing file write; and reading the data from the partition area to the sdram memory of the nand flash, then taking the data from the sdram memory, and finishing file read. The high-reliability linear file access method based on the nand flash realizes file access management of equipment based on the nand flash, and has the characteristics of high efficiency and capability of realizing data access in a file mode.

Description

technical field

[0001] The invention relates to the field of computer storage, in particular to a highly reliable linear file access method based on nand flash. Background technique

[0002] Nand flash is a large-capacity memory chip, which is characterized by high capacity density, low manufacturing cost, and fast access speed. It is usually used as a memory chip on devices such as U disks, solid state disks, and memory cards, but it also has some shortcomings: It belongs to the access method of address and data sharing type, and the access is relatively troublesome. Because it has bad blocks when it leaves the factory, it needs to "skip" the bad blocks for access, and requires a special management method for block management. Currently, there are two main ways to manage data:

[0003] (1) There is no file system access, the user needs to call the function to directly operate the storage unit, which is easy to implement but difficult to use;

[0004] (2) File system acces...

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