Flash memory storage system, flash memory controller and data processing method

Abstract

The invention provides a flash memory storage system, a flash memory controller and a data processing method. The flash memory storage system comprises a flash memory chip, a connector and a flash memory controller, wherein the flash memory controller is configured with a plurality of logic addresses and maps the logic addresses to part of physical addresses in the flash memory chip; a host system uses a file system to access the logic addresses; and the flash memory controller recognizes the logic addresses deleted from the logic addresses and marks data in the physical addresses which are mapped by the deleted logic addresses to be invalid. Thus, the flash memory storage system can recognize data deleted by the host system in the physical addresses, thereby effectively shortening the time required for data sorting.

Description

technical field [0001] The invention relates to a flash memory storage system, in particular to a flash memory storage system capable of identifying data deleted by a host system in a flash memory, a flash memory controller and a data processing method. Background technique [0002] The rapid growth of digital cameras, mobile phones, and MP3 players has led to a rapid increase in consumer demand for storage media. Because flash memory (Flash Memory) has the characteristics of data non-volatility, power saving, small size and no mechanical structure, it is suitable for portable applications and is most suitable for such portable products powered by batteries. A solid state drive (SSD) is a storage device using a NAND flash memory as a storage medium. Due to its small size and large capacity, flash memory has been widely used to store important personal data. Therefore, the flash memory industry has become a very popular part of the electronics industry in recent years. [...

AI Technical Summary

Problems solved by technology

[0004] Generally, the host system uses a file system to manage the storage peripherals connected to the host system (for example, the above-mentioned flash storage device), wherein when the host system wants to delete data previously stored in the storage peripherals, The host system will only update the space information of the file system, but will not instruct the storage peripheral device to delete the data actually, so the control circuit of the storage peripheral device cannot know which data in the physical address has been deleted by the host system

In particular, taking the above-mentioned flash memory storage device as an example, since the flash memory controller of the flash memory storage device cannot confirm whether the data in the physical address has been deleted by the host system, the flash memory controller manages the physical area of ​​the flash memory chip in the above-mentioned alternate manner. It often takes a lot of time to maintain the data that has been deleted by the host system, which seriously affects the writing speed and performance of the flash storage device

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