High-reliability linear file system based on nand flash

Abstract

The invention discloses a high-reliability linear file system based on a nand flash. The nand flash comprises an sdram memory, an nvram nonvolatile memory and a nand flash memory array. The file system comprises a hardware abstraction layer and a software layer, wherein the hardware abstraction layer is used for accessing hardware IO (input / output); the software layer is used for operating a file by accessing an interface of the hardware abstraction layer, and the software layer comprises a partition table initialization module, a file management module and a file access module. The high-reliability linear file system based on the nand flash realizes file management of equipment based on the nand flash, and has the characteristics of high portability, high efficiency, capability of realizing data access in a file mode, automatic loop record, power-off protection of files and the like.

Description

technical field [0001] The invention relates to the field of computer storage, in particular to a highly reliable linear file system 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 access, the ...

AI Technical Summary

Problems solved by technology

[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.

The linear file system is characterized by simple management and high recording efficiency, while the common page table file system management page table is more complicated, without power-down protection features, and the efficiency is slightly lower

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