Some questions about Rockstor

Hello, I am new to NAS solutions, and have a question regarding how the software works. In the quick start, it says “8GB hard disk space for the OS”. Does this mean I have to have a different hard drive just for the OS? Thank you

You will need a seperate storage device for the OS installation (Hard disk, SSD or USB key)

I personally boot from the cheapest smallest SSD I could find, though I’ve heard of many booting from a USB key.