The advantages of SATA for the user lie in the high reliability of the whole system to include an improved air circulation, thermodynamics and easier installation. SATA was mainly created to connect devices inside the computer. The cables and plugs do not have the necessary screening against electromagnetic disturbances, and for this reason the plugs do not have the necessary mechanical properties for operation outside a (screened) housing. The standard has special plugs for SATA hard disks and also for the voltage supply. They are also flat, but wider than SATA data plugs.