1 Each term should be used in one and only one way throughout the dissertation.  The easiest way to avoid a long series of definitions is to include a statement: ``the terminology used throughout this document follows that given in [CITATION].'' Then, only define exceptions.
Serial Peripheral Interface Bus. The Serial Peripheral Interface bus (SPI) is a synchronous serial communication interface specification used for short distance communication, primarily in embedded systems. The interface was developed by Motorola in the late 1980s and has become a de facto standard. Typical applications include Secure Digital cards and liquid crystal displays.
There are three basic SSD interfaces: SATA, M.2/U.2 and PCIe expansion card (which may internally have a M.2/U.2 device). The type of interface chosen depends on the available ports on your motherboard. If you are creating a new build then you have flexibility.