Hackintosh with hybrid laptop

Hi,

I am currently following this tutorial to install a hackintosh.

I have a laptop with a SSD and a HDD. I was wondering if I erase and install High Sierra on my SSD, will my HDD be removed to ?

By the way, on my HDD is currently installed Linux. If I install High Sierra on my SSD, will I be still able to boot Linux by changing the boot order or High Sierra installation will erase everything ?

Thank you and have a nice day ;)