Analysis Of Flash Disk Structure And Application Study Of Its Expanded Function

Ascend to the 20 years of Personal Computer, the history of using floppy driver is even longer than that of using hard disk. Thouth floppy driver has many flaw such as low speed , small capacity , insecurity , it always take important part of PC . Until Intel pushes USB ( Universal Serial Bus) , a kind of Flash disk comes to people ' s eyes which uses flash memory chip , communicating with PC host through USB interface.After several years develop , it becomes to mature and its function is much more than floppy driver.In my design , it mainly does research on the theory and key technology of the removable storage disk with usb interface. It analyses the soft and hard structure of flash disk and finds out the theory of data organization in disk. It also takes SAMSUNG K9F5608UOA-YCBO flash memory chip as example and do much analyse of storage structure and application of flash memory .And it analyses FAT file system in details referring to theory of disk storage and characteristic of flash disk and it finds out the manager model of file storage in flash disk. Basing on research upwards, it brings forward an idea of using flash disk storage area , that is measure off a more security part of disk pre-remained area which is not belong to file system and also can't be accessed by disk file operation . This part can be used as information important storage such as PC key authentication and soft dog authentication. Basing on research of Windows security architecture, it also designs a new Gina ( Graphical Identification and Authenticaton) dynamic link library through VC++ under Windows operation and achieves application of flash disk pre-remained area in PC key and soft dog. Finally it analyses flaw of some soft dog these days , and aimming at that , takes efficient measure to protect authentication information ,improving key identificaion technology and perfects application meaning of the pre-remained area of flash disk.