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Sneakernet is an informal term describing the transfer of electronic information, especially computer files, by physically moving removable media such as magnetic tape, floppy disks, compact discs, USB flash drives (thumb drives, USB stick) or external hard drives from one computer to another, usually in lieu of transmitting the information over a computer network. The term, a tongue-in-cheek play on ''Ethernet'', refers to the use of someone wearing sneakers as the transport mechanism for the data. ''Sneakernet'' is also used to refer to long ping times and the tradeoff between latency and bandwidth. ==Summary and background== Sneakernets are in use throughout the computer world. Sneakernets may be used when computer networks are prohibitively expensive for the owner to maintain, in high-security environments where manual inspection (for re-classification of information) is necessary, where information needs to be shared between networks with different levels of security clearance, when data transfer is impractical due to bandwidth limitations, when a guest laptop is incompatible with the local network, or simply when two computers are not powered up at the same time or lack the correct interconnecting cabling. Because sneakernets take advantage of physical media, different security measures must be taken into account for the transfer of sensitive information. This form of data transfer is also used for peer-to-peer (or friend-to-friend) file sharing and has grown in popularity in metropolitan areas and college communities, sometimes for the purpose of distributing works of authorship. The ease of this system has been facilitated by the availability of USB external hard drives, USB flash drives and portable music players. The United States Postal Service also offers a Media Mail service for compact discs among other items. This provides a viable mode of transport for long distance sneakernet use. In fact, when mailing a sufficiently large hard drive or a spindle of DVDs, the throughput (amount of data per unit time) may compete favorably with other methods of data transfer. 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「Sneakernet」の詳細全文を読む スポンサード リンク
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