Effective Q2 2018, all FRED, FREDDIE, microFRED, FRED-L and FRED-RM systems ship with two (2) NVMe M.2 solid state drive slots.  One slot is used as the operating system (OS) drive.  The second NVMe M.2 slot is open and available for use.   This configuration change adds drive capacity and improves FRED system responsiveness.  FRED systems may be configured with a wide assortment of drive types, capacities, and form factors.  Additional details are available on the web site tech spec pages or in the web store system configuration options.