Abstract:

Based on the study of the document management system NTFS in Windows,this paper proposes a technology for clearing disk data completely.In NTFS the access operation to the files is completed by MFT that is related to the files,so there is a big difference from the FAT system.A tree directory structure is constructed by analyzing the method of MFT managing disk data.The tree directory structure is used as the tool of managing all the MFT tables in the disk.The problem of excessive memory occupation is solved by using the technique of releasing the tree nodes immediately after they are traversed.The technology can not only clear the data directly in the disk sector,but also manage the data more directly.Moreover,it reduces the dependence on the operation system,and it also has the advantages of operability and safety.

Key words: disk data;NTFS;MFT table;sectors;tree