After the partition assistant migrates the system, the ssd displays the D drive instead of the C drive. The C disk of the original mechanical hard disk is still the standard of the display system disk

After the partition assistant migrates the system, the ssd displays the D drive instead of the C drive. The C disk of the original mechanical hard disk is still the standard of the display system disk! What should I do? . . Now that the migration of the operating system has been completed, choose to restart the computer with SSD hard disk. The C drive letter of the original mechanical hard disk will become D. Use the system's disk management program or a third-party tool to delete the D drive letter (not delete the hard disk partition), and this partition will not be seen in the resource manager in the future. If there is a problem with SSD in the future, you can use the system reserved by this partition for emergency use.