I am not sure, this is new to me.
Are you going to format it entirely? Find the option "Create a new partition table", and then create partitions as you want.

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    You sure you've booted Solus in EFI mode?

      [deleted] algent Is there I way to upload a video here or somewhere else and add a link to it?
      P.S I think I found the way.

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      Try shutting the Windows down completely. Hold SHIFT key while powering off (not rebooting) and see if the partitions still look the same in Gparted.

        Emperor It is strange why GParted don't recognise that HDD. If you proceed in that situation you will lose your data there.

          Your video shows you are in a vbox. You have to shut down not reboot to switch from windows.

            CraigMatze algent Well I powered off the PC, un-plug it, then removed the sata and power cabels from HDD1(W10 disk) and then booted. The result was the same-exept this time there wasn't a W10 drive xD only 2TB unknown space 🙁
            I can pottentially copy all the files from that drive and move them to HDD1, but even if I do that I think I will lose some dependancies like Lightroom catalogs, previews etc.
            Isn't there something I can do?! The 2 HDD's are from the same brand-just one is 1TB and the other 2TB.

            [deleted] When I had to do that on windows I had to remove all dynamic partitions from that drive to create a new normal one. So it is not that easy.

              [deleted] Looks like it can but for the W10 HDD is showing me that IT IS basic and therefore I can convert it to dynamic.
              About the HDD 2 it's not showing me that kind of options.
              I can change HDD 2 from GPT to MBR...I can also change one partition from HDD1 to logical and delete the backup W10 partition.

                That GPT Disk looks very complex.

                Probably you should install a third HDD 160GB at least to play with it.

                  algent Or on HDD1 make one partition logical...delete the backup for W10 and I will have 2 free. The only problem is that I will have to use W10 bootloader...unless I delete it and make a fat32 512MB one for Solus, but I am not sure if it will work or not damage W10?

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                  JacekJagosz I said convert on purpose. From what I googled it's possible to convert a full disk to basic.

                  Emperor What do you mean with the W10 HDD?

                    [deleted] Simply the HDD where the W10 is installed.
                    The other HDD(HDD 2) is GPT disk that can't be recognised by GPartition.

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                      Emperor And you're trying to install Solus on the GPT disk?