Data storage device

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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. Electromagnetic data may be stored in either an analog
data or digital data format on a variety of media. This type of data is
considered to be electronically encoded data, whether or not it is
electronically stored in a semiconductor device, for it is certain that a
semiconductor device was used to record it on its medium. Most electronically
processed data storage media (including some forms of computer data storage) are
considered permanent (non-volatile) storage, that is, the data will remain
stored when power is removed from the device. In contrast, most electronically
stored information within most types of semiconductor (computer chips)
microcircuits are volatile memory, for it vanishes if power is removed.