Problem description:
Reinstalling the system partition and merging is because in the ghost system, the wrong option was selected, which caused the entire hard disk to be installed as a C drive. After the installation, naturally there is only one disk left. After the system is reinstalled, it becomes a disk and the data of other partitions is how to find the specific recovery method. 
Tools/Software: Extreme Data Recovery Software
Step 1: After Baidu search and download the software to open, directly double-click the partition to be restored. 
Step 2: It takes a few minutes to half an hour to wait for the program scan to complete. 
Step 3: The program will quickly list the scanned data, and the program will list the scanned partitions. 
Step 4: Select all the data to be restored, right-click and select "Copy Selected File", the program will COPY the checked file. 
Step 5: The last step only needs to wait for the software to COPY the file. 
Note 1: If you want to restore the reinstallation of the system partition and merge, you need to pay attention. Before the data is restored, do not save new files to the C drive.
Note 2: The data recovered by reinstalling the system partition and combining it needs to be temporarily saved to other disks.