Problem description:
Reinstalling the system partition and merging is because when the system is reinstalled, the wrong option is selected, which causes the entire hard disk to be installed as a C drive. After the installation, naturally only the C drive is left. After the ghost assembles the computer, only the data of the C drive and other drives are left. How to find the specific recovery method is described below. 
Tools / Software: Extreme Data Recovery Software
Step 1: After Baidu searches and downloads the software to run, double-click the partition to be restored directly. 
Step 2: It will take a few minutes to half an hour to wait for the software to finish scanning. 
Step 3: The program will quickly find the found files, and the program will list the found partitions. 
Step 4: Check the data you want to restore, and then click Save in the upper right corner, "Save As" button to copy the file on the check. 
Step 5: The last step is just to wait for the program to copy the data. 
Note 1: Reinstall the system partition and restore the data that needs to be temporarily saved to another disk.
Note 2: If you want to restore and reinstall the system partition merge, you need to pay attention. Do not save new files to the C drive before data recovery.