Transferring storage from one partition to another (SSD)

[herpaderpMan]

i have a 240 gb or 256 gb ssd that came with my laptop.
it was splitted when i got it, one part called OS ( C: ) (95,3 GB) and the other called Data ( D: ) (its 130gb) and i want to remove 30 gb from C and add that to the D drive, how do i do this ? (Windows 8.1 64Bit)

 

[Mattios]

You can't just drag it from one to the other?

If you're looking to change the partition size, see this http://www.partitionwizard.com/help/resize-partition.html

 

[popatim]

You can't do this using windows because windows wont touch (shrink or extend) the system partition which appears to be your C: drive.
You will need a 3rd party utility and you also want to completely back up your drive first in case things go wrong.