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magnetic recording

the recording of electrical signals by means of changes in areas of magnetization on a tape, wire, or disc: used for recording sound, video material, digital computer data, etc.

See magnetic recording in American Heritage Dictionary 4

noun
  1. The recording of a signal, such as sound or computer instructions, in the form of a magnetic pattern on a magnetizable surface for storage and subsequent retrieval.
  2. A surface containing a magnetic recording.

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