Electronic data storage requires electrical power to store and retrieve that data. Most storage devices that do not require vision and a brain to read data fall into this category.
USB
Universal Serial Bus (USB) is an industry standard developed in the mid-1990s that defines the cables, connectors and communications protocols used in a bus for connection, communication, and power supply between computers and electronic devices.
USB was designed to standardize the connection of computer peripherals (including keyboards, pointing devices, digital cameras, printers, portable media players, disk drives and network adapters) to personal computers, both to communicate and to supply electric power. It has become commonplace on other devices, such as smartphones, PDAs and video game consoles. USB has effectively replaced a variety of earlier interfaces, such as serial and parallel ports, as well as separate
power chargers for portable devices.
CD Rom
A CD-Rom is a pre-pressed compact disc which contains
data. The name is an acronym which stands for "Compact Disc Read-Only
Memory". Computers can read CD-ROMs, but cannot write on them.
CD-ROMs are popularly used to distribute
computer software, including video games and multimedia applications, though
any data can be stored (up to the capacity limit of a disc). Some CDs, called
enhanced CDs, hold both computer data and audio with the latter capable of
being played on a CD player, while data
(such as software or digital video) is
only usable on a computer
Flash Drive
A USB flash drive is a data storage device that includes flash memory with an integrated Universal Serial Bus (USB) interface. USB flash drives are typically removable and rewritable, and physically much smaller than an optical disc.
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