Windows XP SP2. You can format a disk into NTFS format, and you can apply NTFS file security settings. Check a folder, right key "Properties", you should see the Security tab. If you didn't see it, you should cancel "using simple file sharing" in the folder option. Summary, access is divided into two, folder permissions, and file permissions. The priority of file privileges is higher than the folder permissions. The intrinsic mechanism of file permissions is that when the system creates local users, each user assigns a global unique security identifier SID, such as S-1-5-21-1177238915-842925246-1202660629-1026. Each machine also has its own SID. The local user's SID is located in a system registry or a SAM database? In summary, the system is not based on the username, but is based on the SID to determine the file permission. So, after a user is deleted, even if you create a user who is the same name, the file permissions are naturally different due to the different SIDs. That is, if the previous user sets some private files, they can only be accessed by himself (actually guaranteed by his SID), then when his account is deleted, the same name cannot access his files after his account is deleted. What should I do? You should use the administrator to reset the security attribute of this folder. "Advanced" in the Security tab. Summary, administrators can re-add local users and assign their access. You can specify this permission, is it inherited from the upper directory, or the root directory (called parent object); you can specify that this permission is applied to a subdirectory or file; you can re-specify a variety of permissions. Read, write, execute, list the directory. . . You can re-acquire the ownership of the object. For example, you have no need to read this file. After you become the owner, you can read it.
