About Windows 10
The recommended storage requirement for Windows 10 64-bit Home Premium is typically around 20 to 30 GB, depending on your usage and features.
You're not setting up or saving anything to that storage device.
64-bit systems require around 20GB just for the operating system, comparable to Windows 7 and 8/8.1.
Windows 10 requires less storage compared to Windows 7, 8, or 8.1, making it easier to reinstall without issues.