Concept:The storage capacity of common storage devices is compared by their typical sizes.Explanation:A compact disk (CD) stores about 700 MB.A digital versatile disk (DVD) stores about 4.7 GB.A flash memory device usually stores between 2 GB and 256 GB depending on the type.A hard disk stores large amounts of data, often from 500 GB to several terabytes (TB).Therefore, the hard disk has the largest storage capacity among the options.Answer:Hard disk