
Tape hiss is the high frequency noise present on analogue magnetic tape recordings caused by the size of the magnetic particles used to make the tape. Effectively it is the noise floor of the recording medium. It can be reduced by the use of finer magnetic particles or by increasing the amount of tape used per second to record a signal. It can als...
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http://en.wikipedia.org/wiki/Tape_hiss

(from the article `sound recording`) ...system to organize completely the magnetic domains in these tiny magnetic crystals. The resulting random orientation of the domains results in ...
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http://www.britannica.com/eb/a-z/t/12

The noise of recorded tape.
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http://www.encyclo.co.uk/local/20447

Noise that is characteristic of analog tape recordings, produced by the random fluctuations in the positioning of magnetic particles along the tape, and heard as low-level hiss during playback. The noise, although broadband, is most noticeable in the high frequencies. (WW)
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http://www.encyclo.co.uk/local/22286
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