Case:
After reinstalling the system, I found that there is one left in the partition.
Solution:
After testing by the engineer of our company, the hard disk was formatted into a partition. The previous D E F disk no longer existed, the partition space was occupied 1.3GB. After the system was installed, it was not done.The partition table, first calculate the partition parameters, and then use the software to assist in filling in the partition information. After restoring the partition, the D E F drive data will be successfully recovered, and the success rate is 100%.