Cubi 2 Plus is a MSI barebone mini pc supporting Intel 7th generation Processors with the new mini STX motherboard form factor standard (5x5). The mini STX motherboard is 29% smaller than a mini-ITX motherboard, making it the smallest motherboard with a socket design available. Because of the socket type design, you can upgrade the CPU by your own. Cubi 2 Plus supports a M.2 SSD in the top case and 2.5" SATA HDD or SSD in the bottom case. You can replace the 2.5" HDD or SSD easily by opening the HDD cover.