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Devices that process information (data storage equipment) may either access a separate portable (removable) recording medium or a permanent component to store and retrieve information. Electronic data storage is storage that requires electrical power to store and retrieve data. Most storage devices that do not require visual optics to read data fall into this category. Electronic data may be stored in either an analog or digital signal format. This type of data is considered to be electronically encoded data, whether or not it is electronically stored. Most electronic data storage media is considered permanent (non-volatile) storage, that is, the data will remain stored when power is removed from the device. In contrast, electronically stored information is considered volatile memory With the exception of barcodes and OCR data, electronic data storage is easier to revise and may be more cost effective than alternative methods due to smaller physical space requirements and the ease of replacing (rewriting) data on the same medium. However, the durability of methods such as printed data is still superior to that of most electronic storage media. The durability limitations may be overcome with the ease of duplicating (backing-up) electronic data. TerminologyDevices that are not used exclusively for recording (e.g. hands, mouths, musical instruments) and devices that are intermediate in the storing/retrieving process (e.g. eyes, ears, cameras, scanners, microphones, speakers, monitors, projectors) are not usually considered storage devices. Devices that are exclusively for recording (e.g. printers), exclusively for reading (e.g. barcode readers), or devices that process only one form of information (e.g. phonographs) may or may not be considered storage devices. In computing these are known as input/output devices. An organic brain may or may not be considered a data storage device. All information is data. However, not all data is information.
Data storage equipmentThe equipment that accesses (reads and writes) storage information are often called storage devices. Data storage equipment uses either: portable methods (easily replaced),; semi-portable methods requiring mechanical disassembly tools and/or opening a chassis, or; inseparable methods meaning loss of memory if disconnected from the unit.; The following are examples of those methods:
Portable methods
Hand crafting;
Flat surface
Printmaking;
Photographic;
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