It's likely that your hard drives are all formatted with one large partition.
The major advantage to splitting up individual disks into multiple partitions is to soften the blow when you need to reinstall your OS. This is achieved by putting your OS and applications on one partition and your media on a separate one.
For Windows users, there are several third-party programs that you can download/purchase that will assist you with this process. In reality, none of these are really necessary because Windows comes with a built-in (and well-hidden) disk-management system. Let's get started.
Find the disk manager
Step 1: Open the Start menu and type "disk management" into the search window. Click on the entry that appears labeled Create and format hard-disk partitions.
Create empty space on the hard drive
If didn't build your computer, the chances of having unformatted space is pretty unlikely. If you actually do have unformatted space, or you just bought a new hard drive and are partitioning it, you can skip this part.