How do I optimize my drives if I have 2 drives

Guess what? You have run into the limitation of the SATA interface itself. If that 480 GB SSD is a SATA one, it simply cannot handle both the OS and video editing media files at the same time.

Worse, the included 2 TB HDD is only a laptop-class HDD that only spins at 5400 RPM. As such, it will struggle to even achieve 130 MB/s on the outer tracks - and that's only for reads. With simultaneous writes thrown into the mix, you'd be lucky to even achieve 60 MB/s in overall disk I/O throughput.

And although the mini-ITX motherboard supports m.2 NVMe, it has only one such socket. Unfortunately, Corsair opted to configure that socket to hold the OS (primary) drive on models that include an m.2 NVMe SSD, with apparently no way at all to reconfigure it for secondary internal storage. This greatly complicates viable storage options.