@[deleted] @algent Hey guys-good news 🙂
With the help of mfleetwo from GParted forum I figure out how to manage this drive, here is a link:
http://gparted-forum.surf4.info/viewtopic.php?id=17824
But now I have yet another problem-now I can't install the bootloader on the HDD, where Solus is...it only gives me the ability to install bootloader on the HDD of W10. I don't think that would be a good idea-for more info please check the link to GParted forum.
Also I saw somewhat a similar problem here on this forum(I can't to install Bootloader in my partition...), but from what I can see by @JoshStrobl it's because either 1-they are on legacy mode(I am sure I am using UEFI, because following the instructions I get an image of Solus logo and then I go into the Live OS, instead of me getting only plain text like in old BIOS) or 2-my HDD is not a GPT but a MBR(well quite the opposite-HDD2 where Solus is is GPT, while HDD1 where W10 is and where Solus wants it's bootloader is an MBR).
I have posted a link to video in the GParted forum if you wanna see the HDD configuration and partitions as well as the installation process of Solus.
Update-even when I remove HDD1 I can't put bootloader on HDD2:

I followed the instructions, creating 768 MB FAT32 partition with boot and esp flags-now when I boot the PC there is a new boot option:UEFI HDD2. Still the installer is asking me for MBR partition?!

MBR old.
GPT new.

GPT must used for EFI.

EFI puts bootloader on a partition
Legacy puts the bootload on the MBR (master boot record) of a drive, not a partition.

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    • Post #66

    Emperor You do not need other than primary partitions in this case.

    You can put flags after committing the changes to disk.

        [deleted] I figured it out after long searches xD
        It's like people telling you you have engine problem, but don't explain you how to repair the car...
        Now I can't get how to deal with that bootloader.

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            • Post #68

            Emperor Unplug the W10 drive altogether and boot the live usb in UEFI

                [deleted] Already tried-now again, but nothing.
                Basically it boots on UEFI and is showing me only 1 option-reboot into the firmware-after that I can rearange the boot order-as long as the first one is UEFI USB I can only reboot and enter the firmware-when I choose only USB then it boots, but can't create bootloader, thus can't create an OS-it's showing me only that it can't find a valid bootloader location(MBR disk).

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                    • Post #70

                    Emperor That's because it's not booting in UEFI.

                        [deleted] How to make it boot in UEFI?
                        I dissabled all options for legacy boot in BIOS and the USB is only restarting(don't want to work with UEFI), Windows is in Legacy so it won't start either.
                        How to make that UEFI work? Is it something in the settings or I installed it on the USB the wrong way? The USB is FAT32 formated. I have GPT HDD and inside it I have FAT32 partition with boot and esp flags. I do not boot with secure boot.

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                            • Post #72

                            Emperor Another option would be to make the HDD2 MBR.

                              @[deleted] @algent Hey guys: we've made it!
                              The longest installation of Solus in history xD I'm a little sad this happened on the 71th post and not on 69th, but whatever.
                              There were 2 big problems, which I learned how to deal with: the first is that you have to prepare everything with GParted and then try to mount, not via Gparted, but via the installer.
                              The secound big problem was that I followed the instructions on the Solus website, which said that I have to create MBR scheme for BIOS or UEFI...when I re-burned the USB with GPT scheme, everything, just worked 🙂 I must admit that I confused the BIOS interface with UEFI when booting Solus.
                              So here we have it-from my testing I don't like the file system so much, but I will get used to it. Solus is very very fast 🙂 It's booting is like 3 times faster than W10! It's also very lightweight-I can all the needed programs and some games in less than 10GB!
                              Unfortunately Waterfox and Joplin aren't available in the software center, but I will learn how to install from other things like snap.
                              All in all everything is fine, exept now I am only booting into Solus xD
                              How can I make the bootloader check that there is a Windows and give me choice to boot it?
                              Also when I turn it off and then on my swap partition and many others get unmounted?! Only the home(which is part of root) is mounted automatically...how can I deal with that?
                              Which is THE virtual machine for Solus(for W10 I consider it to be Oracle VM)
                              And most importantly I wanna thank you for the help 🙂
                              Still can't belive you wasted 2 days trying to help me :0 :

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                                • Post #74

                                Emperor Congrats! It for sure has been a ride.

                                Waterfox is available from their official site as an archive you can just extract and run. Joplin isn't included apparently due to not having any increased value over boostnote.

                                For partitions to mount automatically you need to edit /etc/fstab, or adjust the settings via GNOME Disks.

                                    Congrats. With all these steps you have done, take some notes and save them because you will forget soon.

                                    Emperor How can I make the bootloader check that there is a Windows and give me choice to boot it?

                                    Try to update grup: $ sudo update-grub

                                    If it fails, try to mount the Windows partition where the system is installed just by opening it with File Manager and then do again
                                    $ sudo update-grub

                                        [deleted]
                                        Playing with fstab is dangerous because the system may go to emergency mode, not sure what happens with the data.
                                        Of course you can remove what you did add to fstad with $ sudo nano /etc/fstab and then reboot.

                                          algent So I have to type the $ before the command? I found that command and tried to use it but it wanted me some sudo password...which to begin with is hard to write and it's not my password.

                                              [deleted] Wow...why it just doesn't save this setting automatically?
                                              Never heard of boostnote-I will definitely check it out 🙂

                                                boostnote is more complex and seems like it's geared towards developers and code-writers.
                                                Joplin is more private, local, and FOSS alternative to Evernote-it's simple to use and it has web-clipper-it can handle large ammount of bulky notes and organize them.
                                                So my best bet is to search for snap...

                                                [deleted] Gnome disks is where I found that I can mount them-so even from there it didn't save the changes.