Flash memory devices magnetic storage devices optical storage devices actuator actuator axis chassis diskette floppy drive hard drive head arm hybrid hard drive magnetic tape platter read/write head solid state drive(SSD) spindle motor track compact disc(CD) digital versatile disc(DVD) disc burner double-sided disc dual layer DVD DVD recorder laser beam . Flash card reader flash memory card non-volatile U3 smart drive USB flash drive volatile volatility conform to a standard backup have a limited capacity have high/large capacities hold data move data from place to place store data write data onto . System software application software operating system graphic user interface command line interface open-source software proprietary software/closed-sources software kernel shell WIMP environment window icon drop-down menu submenu pointer toolbar taskbar desktop system tray dialogue box user-friendly cross-platform cost-effective compatible compatibility powerful sophisticated version develop development modify distribute distribution interact interaction multitask execute execution support enable release preload device driver media player.