Extend Volume on C: Drive grayed out, can't extend volume.

So I want to add/extend two disk into one: Disk 2 to Disk 0 (I want to extend C drive) Disk 3 to Disk 1 (I want to extend D drive) Can I add them without formatting C/D drive? Here is the screenshot http://i.imgur.com/CNfUJFN.jpg?1

Why can't I add my remaining 500GB unallocated space on to my drive C? but I can extend it on my drive D. Any help will be appreciated.

I have a Drobo system with 16 TB of hard disk. Windows has it allocated as a 2 TB and a 14 TB for some reason. I formatted the 2 TB as seen in the first screenshot. I then Right click in the computer management window and click on Extend Volume. This is seen in the second screenshot. I then click...

I don't get the option to extend my logical partition for some reason im trying to create a fifth partition so i took some GBs from my c partition which is unallocated spaced and want to add it to my logical drive to make another partition but the extend volume option is greyout im confused how can...

hi peeps, how can I extend my C drive volume? i tried using disk management, but the "Extend volume" option for C drives fade off, but not other drives. any idea how to extend the drive?