a magnetic tape reel:

a magnetic tape reel:

a magnetic tape reel or cartridge or cassette has to be first loaded on to a tape drive for processing, once loaded. the magnetic tape is said to be on/line. that is. it can now be used for storage or retrieval of data by the computer system, when processing is complete. the tape is removed form the tape drive for off/line storage’ that is. it is stored away form the computer system, and data on it are not accessible to the computer system. until it is loaded again on the tape drive.
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