Provided is a two-way RAID controlled storage device of a serial attached small computer system interface/serial advanced technology attachment (SAS/SATA) type, which provides data storage/reading services through a PCI-Express interface. The RAID controller typically includes a plurality of disk mounts coupled disk connect controller, which itself is coupled to a set (e.g., at least one) of PCI-Express SSD memory disk units. In a typical embodiment, the plurality of PCI-Express SSD memory disk units comprising a plurality of volatile semiconductor memories. The RAID controller further comprises a plurality of disk monitoring units coupled to the plurality of disk mounts for monitoring the plurality of PCI-Express memory disk units; a plurality of disk plug and play controllers coupled to the plurality of disk monitoring units. A plurality of high-speed host interfaces are coupled to: the plurality of disk mounts, the plurality of disk monitoring units, and to a plurality of disk controllers. Further coupled to the plurality of disk controllers is a two-way RAID controller, which is also coupled to the disk connect controller and to a host connect controller. The host connect controller is further coupled to a plurality of host interfaces, which themselves are coupled to the plurality of disk controllers.