Extremely useful! No need external hard drives! Mac direct connection to Mac, PC to PC, the system is OS X, Windows or GNU / Linux !!! Facilitates data transfer method F2F (Friend 2 Friend)! (Simply brilliant moreover, allowed me to flash on my Android Hackberry after installing drivers Hackberry and have started in FEL mode) Although a USB 2.0 cable AA: 100% virile male 100%!