I want to install Ubuntu as a dual boot on my computer, I have a SSD and a HDD which is accelerated with a Corsair Accelerator 30 GB. Because there isn't much space left on my SSD I want to install ubuntu on my hdd. When I'm booting the installation, it finds my 2 TB hdd but it's saying there isn't a thing on it while there's already 300 GB's used. Can I just use GParted to make a new partition or will this erase my hdd? If I can't make a new partition, how can I install ubuntu without erasing my HDD?