Motherboard & System Unit. System Unit. The box in which the motherboard and other components of the computer is stored. On a desktop computer it’s typically a box that contains everything except the input/output peripherals (monitor, keyboard, mouse, printer, speakers, etc).
SCSI – (small computer systems interface)
primarily used for connecting storage devices
such as hard drives, tape drives, optical drives,
usually to servers. These connections are
SATA– (Serial ATA) typically used to connect hard
drives, optical drives internally.
ESATA is an external SATA connector.