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Magnetic storage
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Magnetic storage or magnetic recording is the storage of data on a magnetized medium. Magnetic storage uses different patterns of magnetisation in a magnetizable material to store data and is a form of non-volatile memory. The information is accessed using one or more read/write heads.
The programmable calculators of the HP-41-series (from 1979) could store data via an external magnetic tape storage device on microcassettes.
The programmable calculators of the HP-41-series (from 1979) could store data via an external magnetic tape storage device on microcassettes.
Hard drives use magnetic memory to store giga- and terabytes of data in computers.
Hard drives use magnetic memory to store giga- and terabytes of data in computers.
Signal
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Signal refers to both the process and the result of transmission of data over some media accomplished by embedding some variation. Signals are important in multiple subject fields including signal processing, information theory and biology.
In The Signal by William Powell Frith, a woman sends a signal by waving a white handkerchief.
A Finnish distant signal at the western approach to Muhos station is displaying Expect Stop.
A Finnish distant signal at the western approach to Muhos station is displaying Expect Stop.
A woman hailing a cab is sending a signal of availability to be picked up.
A woman hailing a cab is sending a signal of availability to be picked up.
A flare is a common means to signal during dark or smoke-filled conditions.
A flare is a common means to signal during dark or smoke-filled conditions.