Problem characteristics: The hard disk partition drive letter can not be accessed, the file system shows RAW, not NTFS, used space, free space and capacity information are 0 bytes, double-click display "Cannot access C:, file or directory is damaged and cannot be read Take ” Solution: Method 1, right click on the RAW format drive letter, select the attribute, then select Security, delete the useless user, add your own user name, and then change the permissions. If there is no security option, you can remove the “Use simple file sharing” checkbox in the folder option (Open My Computer, select the Tools menu, and then select the folder option) to click on the NTFS format disk. Right click and the security options are displayed in the properties menu. Method 2, enter “ control panel & rdquo; find & ldquo; management tools & rdquo; open it, open the "local security policy", open the "security options", find the "right" window in the right window Access: Local account sharing and security mode & rdquo; after the "only guest" changed to "classic", quit back to my computer, right click on the D drive to find the "security" tag, put it Delete the garbled characters and add the users of this computer. Note: The first and second methods are for the NTFS format. Unfortunately, the hard disk I encountered is just the FAT32 format. Method 3, [Note: After this method restores HD video files, the file resolution will be reduced and the audio file may not play.] 1. Use EasyRecovery Pro 6.06, select Data Recovery Advanced Recovery (select advanced option to customize data recovery function) 2, select the drive letter that has been changed to RAW format, click the advanced option in the lower corner; 3, in the file system scan, select "NTFS" for the file system, click Advanced Scan, select "Advanced Options" in the lower right corner, Set the cluster size and data start position to 0; 4. Click the partition setting, use the MFT method (this must not be wrong); then confirm; 5. Click Next to start scanning the file system, then wait, ask Time is long, be patient. Upon completion, you will find an NTFS drive letter, click on the found drive letter and start scanning. 6. After the scan is complete, you will find all the files found, then click Restore and select an available disk to save. The file you restored will do; 7. Finally, format the problematic disk and copy the recovered file back to OK. Everything is intact. Note: The third method I tried is that the data can be recovered, but it takes a long time, and it is not restored according to the original file name when recovering. All file names are changed to file1? file100……, file name change It didn't make much sense. I later saw a way to restore data on the Internet. I think this method may be really possible. First, make the RAW format hard disk use Ghost as the image file, and then use Ghost Explorer to restore the data. Method 4: I accidentally found a tool PTEDIT32.EXE (partition table editor) attached to Norton PartitionMagic 8.0, just try it, open the information to find the corresponding partition, and compare with other partition information, found that there is a big Different, at this time, compared with the information of other partitions to modify the information of the partition that is in error (each hard disk partition is different, so there is no standard parameter), you can resume operation, so don't worry, it will not damage the data, save it after modification. After restarting, you're done! Note: The first thing I think is that the partition table is broken. The most important thing to think about rebuilding the partition table is to use Disk Genius (because I don't have PTEDIT32.EXE in my hand), select “rebuild partition table in the menu toolbar. ;, Disk Genius began to search and rebuild the partition. Disk Geniusn will first search for the hidden sectors starting from 2 sectors for the 0 cylinder 0 head, looking for the partition table that has been moved by the virus. Next, search for the first sector of each head. The search process can be performed in either "automatic" or "interaction" Automatically retains every partition found, which is suitable for most situations. The interactive mode gives a prompt for each partition found, and the user chooses whether to keep it. When the partition table in the automatic mode reconstruction is incorrect, you can re-search in interactive mode. I did not succeed in rebuilding the partition table in either "automatic" or "interaction". Method 5: First cp ~/.bash_history ~/cmd_history Back up the commands you have played, and then find out what commands you used in cmd_history. Method 6: Modify the drive letter method, change the RAW drive letter, if it is C, D, E, F, F is the RAW drive letter, then change F to E, you can recover. Other additions: Solution 1: System permissions issue 1 (the original system is a problem with the NTFS format) Right click on the RAW format drive letter, select "Attributes", then select "Security" to delete useless users. , add your own username, and then change the permissions. If there is no security option, you can remove the “Use Simple File Sharing” option in the folder option (Open “My Computer”—Select“Tools> Menu— Reselect “Folder”option) The front hook, you can right click on the NTFS format disk, and the security options are displayed in the property menu. Solution 2: System privilege problem 2 (the original system is a problem in the NTFS format) Go to “ Control Panel & rdquo; find & ldquo; management tools & rdquo; open it, will open the "local security policy", in the “Security Options”Open, find in the right window "Network Access: Local Account Sharing and Security Mode" "Only Guest”Change to "Classic", quit back to my computer, at Turn on the RAW disk and right click to find the "Security" label, delete it garbled, and then add the user of this computer. Solution 3: Modify the drive letter How to change the RAW drive letter, if it is C, D, E, F, F is the RAW drive letter, then change F to E, you can recover.