There are partition managers that can do this on the fly, but they all cost money. With Windows, how you would do this is backup everything, delete D:, extend C: using Disk Management or diskpart, then restore data to the smaller partition. Does house anything beside regular Shared data?  
Hello, I need some help please. I have a Power Edge T 430 server. I am running out of space on C drive. I have 2 partitions which is C and D. What is the safest way to extend the C drive by taking some from D drive partition?  I know that i cannot do this from Windows but is there a software that does this safely? How do i check the current raid configuration? If adding another hard drive the safest way how do i do this so the C drive has more space. Thanks in advance.  
Power Edge T 430 Help With Storage Raid Configuration