How do I organize my single disk drive properly?

[TheFuse]

My laptop has one 500 GB HDD. The way it is managed/formatted/organized seems to out of place to me. Here is how it is organized.
1.) Volume: (no name)/Layout: simple/ Type: basic/ Status: Healthy (recovery partition)/ Capacity: 15.00 GB

2.) Volume (C : )/ Layout:simple/ Type: Basic/ File System: NTFS/ Status: Healthy (Boot, Page file, Crash dump, Primary partition)/ Capacity: 100.00 GB

3.) Volume (D : )/ Layout:simple/ Type: Basic/ File System: NTFS/ Status: Healthy (Primary partition)/ Capacity: 350.66 GB

4.) Volume: SYSTEM/ Layout: Simple/ Type: Basic/ File System: NTFS/ Status: Healthy (System, Active, Primary partition)/ Capacity: 100 MB

Now I don't know why but nothing gets put on drive D. Everything I install goes in the smaller drive, C. How do I fix this? Drive C is almost full. I was hoping to just have the OS partitioned and then the rest is storage.

 

[USAFRet]

1. Leave it. Recovery data

2. OS and applications. C drive

3. Empty D drive

4. 100MB System Reserved. Leave it alone.


So....for the unused D drive. You can cause your browsers to save stuff there, and potentially make your default Documents/Music/Videos go there.
This tutorial is aimed at SSDs, but the same concepts work:
http://www.tomshardware.com/faq/id-1834397/ssd-redirecting-static-files.html