That's actually not a problem of Solus - it is not possible to use a drive bigger than 2 TB with an MBR partition table in BIOS mode.
There are two things you can do:
boot your system in UEFI mode so Solus will create a GPT partition table that will work with your HDD
i cant install solus because the setup is crashing to desktop.
ISO: Solus 3 Budgie