Because sneakernets take advantage of physical media, security measures used for the transfer of sensitive information are respectively physical. A sneakernet 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 particular system is simply incompatible with the local network, unable to be connected, or when two systems are not on the same network at the same time. Sneakernets are in use throughout the computer world.
Memory cards are a popular physical medium for transferring files and have become smaller in size as technology has advanced.
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