Research Of Data Restructuring On Flash Chips

This paper focus on the data restructuring of Flash chip inside of storage tools like U-disk. As a new generation of the semiconductor memory, Flash memory has very outstanding performance on storage density and access speed, etc. so it is used for the production of file storage, it can overcome the problems what disks lack of, which is about volume, power consumption, resistance to harsh environment. However, Flash memory has completely different structure with traditional disk, which is the special erase block structure. Furthermore, File system used on Flash memory also differs from on PCs'. So works of data recovery on Flash face many problems inconsistent with old data recovery methods.This task is about one aspect of data recovery—data restructuring, its main purpose is that when U-disk controller (U-disk peripheral circuits)is broken, if the Flash chip inside has not been damaged, then the data on chip can be read out and restructure to the form that can be identified by operating system through some method so that the data will not lost. To get the original data of Flash chip, we can use Flash Programmer. After that, transfer the data into computer to save as a binary image file. The focus of this issue is the task of data restructuring over the binary image file. Because of the extensive application and lots of advantages on U-disk storage of FAT32, this project chooses the Flash memory with FAT32 as the data storage form, read out the data and then restructure to the original FAT32 form, so as to obtain the goal of recovering the original data to the form that can be organized by users not though the U-disk controller.The first step of this study is doing some research on U-disk, combined with FAT32, for the analysis of internal structure and data access methods, find the relationship between logic address and physical address of data. Then use this relationship, put all the data to the right logic place to form a identifiable logic disk, so that users can get the files on Flash chip.