Click Start, input Disk Management in the search box, press ENTER to open the Disk Management.
See the Volume you have, What's the status of your D drive?
Where did you find the D partition marked as "system" partition? Could you provide us with a screenshot?
Do you have some system files in D drive? Or did you put the Desktop on your D drive?
Check the computer for more details.
Regards,
Miya
Miya Yao
TechNet Community Support
