Second HDD wasn't recognized by bios boot priority menu. But it was recognized by bios device menu.

OLEKSII314314

Hello. I have strange question.
Few weeks ago I bought predator helios 300 (ph317-52). It had pre-installed SSD with 256 gb inside and free slot for SSD/HDD. Also I bought SSHD firecuda with 2 tb for this free slot. After installation I came to bios and was little bit surprised. My first and second drives were recognized in information bios menu. But in boot priority menu only first SSD 256 drive is seeing. 
Anyway, after Windows 10 installation windows detected both drives without any problems. And inside Windows I can normally work with SSHD 2 tb drive. But it's srill hidden for bios boot priority menu. Is it normal? Or maybe I made smth wrong? So can you please help me with this?

Thank you in advance.

xapim

Only the system drives will show up in the windows uefi boot loader so it's completely normal but I think getting an sshd it's a huge waste of money they are useless when not used as system drives they won't cache anything and are slower than the stock hdds I have 2 as system drives one firecuda and a toshiba that's much faster than the seagate and my firecuda died less than one month after I got it as usual lost everything my experience with seagate its from bad to worse burned (they died) more than 30 hdds over the years never had a single issue with hgst Toshiba neither wd