XP how to solve backup folder denied access problem

Before reinstalling Windows XP system, in order to avoid the loss of important data files, I backed up the files in "My Documents" to D drive, reinstalled Windows XP after formatting C drive, and found that after installation. The original user account cannot access the backup file of the D drive. Why is there a problem of denying access?

Analysis of the cause: The author's computer uses the NTFS file system, so all files or folders are subject to ACL (access control authority). Although the "RTJ" account is used to access the files in Windows before and after reinstalling the system, it should be noted that each access account corresponds to a unique SID (security identifier). The function of the ACL is to judge the SID. Whether the account can access a file.

Although the author also uses the "RTJ" account to access it after reinstalling the system, the SID corresponding to the "RTJ" account is different from the previous one. Therefore, there is a case where the "RTJ" account cannot access the backup folder after reinstalling the system.

Solving the problem: Solving this problem of denying access is actually very simple. Re-grant the "RTJ" account access right in the "Security" tab of the backup folder.

Step 1: Log in to the system as the “Administrator” account, click “Tools→Options” in the Explorer, and switch to the “View” tab in the “Folder Options” dialog box that pops up, cancel "√" in front of "Use Simple File Sharing", and finally click the "OK" button (the purpose of this setting is to find the "Security" tab in the properties dialog of the backup folder).

Step 2: Right click on the backup folder in the D drive, select the "Properties" option, and switch to the "Security" tab in the pop-up properties dialog box, then you will be in the "Group or An "unknown account" item (Figure 1) is found in the User Name column. This is the "RTJ" account in front of the reinstallation system. Since the SID value has changed after reinstalling the system, the system cannot recognize the account. This caused the "RTJ" account to be denied access.

Figure 1

First delete this unknown account, then click the "Advanced" button in the Security tab, the "Advanced Security Settings" dialog box will pop up, switch to the "Owners" tab. At this time, the owner of the backup file will be unknown, and of course the "RTJ" account cannot be accessed. Then change the owner to the "RTJ" account (Figure 2), and remember to select the "Replace subcontainer and object owner" option below and click the "Apply" button.

Figure 2

Step 3: In the "Advanced Security Settings" dialog box, switch to the "Effective Rights" tab, click the "Add" button to add the "RTJ" account to " Permissions item in the list box. In the process of adding an account, be sure to give the "RTJ" account the "full control" permission, and finally click the "OK" button to complete the modification. In this way, the "RTJ" account can access the files in the backup folder without any denial of access.