AlexDeGuy :
Reyaz123 :
If c drive was already the main drive you used to save files, do this
If you have no important info on drive d, (if you remember that you didnt install windows into drive d) you can do this
While logged into windows do this:
Open disk management
Delete the volume in disk management by right clicking your d drive and select delete volume
Then right click your c drive and select expand volume. Keep clicking ok and finish
Is there any risk doing this?
Yes but only if:
You have the windows files, folders, program files folder and you installed your OS on the D drive, do not do it
If you have the windows files, folders, program files folders, and you installed your OS on the C drive, there is no risk in extending your drive with the deleted d drive volume.