“Backing storage devices are where you can store data permenantly. This means that data is held when the computer is switched off and can be loaded onto a computer system when required.
The hardware that stores the data are called backing storage media. The media are put into backing storage devices.”
常见的Backing Storage有软盘Floppy Disk Drive，CD-ROM drive，USB Flash Drive，DVD-ROM Drive，Hard Disk Drive等。