Apparently, Intel's RST is not just RAID, but it's also supposed to help when a laptop is equipped with two storage devices, one small and fast (SSD) and anothe

Apparently, Intel's RST is not just RAID, but it's also supposed to help when a laptop is equipped with two storage devices, one small and fast (SSD) and another big but slower (HDD): https://superuser.com/a/1578326 https://superuser.com/a/1578326 IIRC there were Dell XPS models like that in the lower price segment. Never tried one personally.