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In computing, mass storage refers to the storage of large amounts of data in a persisting and machine-readable fashion. Devices and/or systems that have been described as mass storage include tape libraries, RAID systems, and a variety of computer drives such as hard disk drives, magnetic tape drives, magneto-optical disc drives, optical disc drives, and solid-state drives. It also includes experimental forms like holographic memory and historic forms like drum memory, floppy disk drives and punched tape. Mass storage includes devices with removable and non-removable media. It does not include random access memory (RAM), which is volatile in that it loses its contents after power loss. == Definition == The notion of "large" amounts of data is of course highly dependent on the time frame and the market segment, as mass storage device capacity has increased by many orders of magnitude since the beginnings of computer technology in the late 1940s and continues to grow; however, in any time frame, common mass storage devices have tended to be much larger and at the same time much slower than common realizations of contemporaneous primary storage technology. The term ''mass storage'' was used in the PC marketplace for devices far smaller than devices that were not considered mass storage in the mainframe marketplace. Mass storage devices are characterized by: * Sustainable transfer speed * Seek time * Cost * Capacity 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「Mass storage」の詳細全文を読む スポンサード リンク
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