Boot order of MBR and GPT system disks?

Question

BIOS

Hello! Help who can
On my computer (Hewlett-Packard HP Compaq Elite 8300 CMT motherboard, photo characteristics ibb.co/h1fCjRk) Windows 7 is installed on an SSD (connected to SATA 0, MBR), I bought myself an HDD (connected to SATA 1, for some reason, when installing Windows 7 on it, I had to convert it to GPT). I wanted to work on an SSD (so that it automatically starts when it boots), and divide the HDD into 2 partitions: a backup system (if the SSD is covered), file storage. But no matter how I didn’t conjure (and changed ibb.co/3vzZnfg in BIOS, and SATA in places), but the HDD (SATA 1) still starts up first SSD (SATA 0). I think that this is due to the fact that the BIOS always gives GPT priority (more images from the BIOS that may help clarify the situation: ibb.co/qBS4MNR, ibb.co/tZ8mbbG, ibb.co/f2QcHqx, ibb.co/bsDw4Rp).
Is there a way to make the SSD always boot first? (Now I only have the option of formatting the HDD to MBR and reinstalling the system. I don’t want to touch the SSD, there are a lot of programs and settings installed there).
P.s. Please don't answer too hard as I'm not a computer professional.

Answer 1

The wording of the question is not clear.

I bought myself an HDD (connected to SATA 1, for some reason I had to convert it to GPT when installing Windows 7 on it)

Firstly, as I understand it, you decided to install another, second, Win7? What for???
Secondly, why mark up the HDD in GPT? At the time when Win7 was relevant, GPT did not exist yet, so installation problems cannot come from anywhere.
Now about how I would solve a similar problem for myself.
1. I mark up all disks in MBR (I don’t like GPT, although maybe I just don’t know how to cook it . Four MBR partitions per disk have always been enough for me).
2. I divide the HDD into 2 partitions - for the OS reserve and for user data.
3. No second backup OS! To do this, it is enough to make a backup copy of the first OS that is on the SSD (of course, after it is filled with custom software, configured and tested). This backup can simply be placed on the HDD (then it will have to be unpacked to the system disk before use), or you can arrange the so-called. "hot spare" - one-to-one clone the system SSD partition to the HDD partition intended for the OS, and then make it inactive (i.e. non-bootable, using any partition manager) and hidden (using the option "Disk Management" in the OS), then it will not be visible and will not interfere with the boot. In the case of such a "hot standby", you can switch to it by unhiding and setting the "active" flag (with an SSD, you must do the opposite).