If you're formating the whole hdd, I'll suggest you to make 2 partitions: C (for Windows OS, and programs ) and D ( for your data ).
Also, if you use backups, images... will be good to create one partition for it.
Will be good to tell us the HDD size.
My Computer
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Custom Build
OS
Windows 10 Pro x64
CPU
Intel Core i5 4440 @Stock
Motherboard
Gigabyte Z97 D3H
Memory
4 x 4GB HyperX Fury DDR3
Graphics Card(s)
Gigabyte GTX 1050Ti O4G
Sound Card
Integrated
Monitor(s) Displays
Dell P2417H
Screen Resolution
1920 x 1080
Hard Drives
Samsung EVO 850 120GB / Toshiba DT01ACA050 1TB 7200prm 32MB
PSU
Riotoro Onyx 750W
Case
NZXT H500 Black-Red
Cooling
Stock CPU + NZXT 120mm + 2x120mm red fans
Keyboard
Modecom Volcano Lanparty
Mouse
Asus ROG Gladius / DeepCool E-Pad Plus
Internet Speed
DOCSIS 50/3 Mbit
Browser
Google Chrome
Other Info
Asus K55VJ(i5 3210M, GT635M / 2GB, 8GB DDR3, 500GB HDD)