Solid State Drives also have the benefit of scalability in terms of the form factors that are available. Solid State Storage can be implemented in many different form factors, from microSD or eMMC to 3.5” drives. Additionally, Solid State Drives allow users to choose the optimal Host Interfaces: they are available as SD, MMC, USB, S-ATA, P-ATA/IDE, CF, SAS, or PCIe, while HDD host interfaces are mainly limited to interfaces driven by the PC market which today primarily uses S-ATA . The combination of scalability of form factors and versatile interfaces gives the designer considerable advantages over HDD’s in the design of their application.