Your computer may have confused the system startup disk.

If you can use DM, use that low-profile hard disk. Reproduce the system.

Another way is to make sure that your machine is not a startup disk problem, and then download a dwarf DOS program. Then install. After restarting, you have a choice, and then you enter the Dwarf Studio. That's DOS mode. You can choose drive C or drive D that you don't want to format.

The method is as follows:

Dir:e (this is a file for viewing other partitions, you can add it at will,) and press enter.

Format c or d: q carriage return

Then the system will prompt. If you choose y, you are sure.

Then you deleted the system you didn't want.

After that, just restart.