Thanks all - this has been so helpful. My system came with a dedicated ‘PERC’ RAID controller card which is probably very good but I should have chosen RAID 0+1 or 10 for speed. But using 2x or 4x the disk space, I would have already exhausted it due to my extravagant ‘Lose Nothing’ policy. I have an idea to install a RAID 10 array of SSDs on my unused SATA motherboard connectors, re-install OS and all Steinberg apps and resources on that and only load ‘active’ projects to save disk space. Would this work or should I go for a PCIe-mounted SSD setup?