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:''This article is about external storage devices. For external storage in the context of data structures, see Reference (computer science)#External and internal storage.'' In computing, external storage comprises devices that temporarily store information for transporting from computer to computer. Such devices are not permanently fixed inside a computer. Semiconductor memories are not sufficient to provide the whole storage capacity required in computers. The major limitation in using semiconductor memories is the cost per bit of the stored information. So to fulfill the large storage requirements of computers, magnetic disks and optical disks are generally used. ==Advantages of external storage== * External storage devices provides additional storage other than that available in computer. * Data can be transported easily from one place to another. * It is useful to store software and data that is not needed frequently. * External storage also works as data back up. * This back up may prove useful at times such as fire or theft because important data is not lost. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「External storage」の詳細全文を読む スポンサード リンク
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