Combing drives and installing os

[zjpleet]

I have 4 HHD for an old system for a friend. I want to combine all 3 and use them as 1. I then want to install Windows 10 pro on the virtual 1 disk. I tried doing this and got an error when installing the OS via USB. 2 are 300gb drives and 2 are 500gb drive. The system is old and only has 4gb of RAM, I plan on upgrading the specs. But for now just want to know how to make 2 or 3 drives act like 1, and then install Windows on the. I don't know if this makes a difference. I would prefer to have the 2 300gb and 1 500 gb, but whatever works.

 

[USAFRet]

The only way to do this would be within Windows Storage Spaces, and I'm not sure of the exact steps to get there.
But this is a seriously bad idea.

Why do you want to do this?
Windows and applications have gotten really really good in managing multiple drives and drive letters.