A recording head is the physical interface between a recording apparatus and a moving recording medium. Recording heads are generally classified according to the physical principle that allows them to impress their data upon their medium. A recording head is often mechanically paired with a playback head, which, though proximal to, is often discrete from the record head.
The two most common forms of recording head are:
- Magnetic - Magnetic recording heads use the principles of electromagnetism to coerce a paramagnetic recording medium, such as iron oxides, to orient in a readable manner such as magnetic tape. Record heads are constructed of laminated permalloy, ferrite, or sendust. As of 2006 this is by far the most dominant type of head in use.
- Optical - Optical recording heads use the principles of optics and light to impart energy on a recording medium, which accepts the energy in a readable manner, e.g. by melting or photography.
Note that Magneto-optical recording, though using optics and heat, should properly be considered a magnetic process, since the data stored on magneto-optical media is stored magnetically.
Earlier systems, such as phonograph records, used mechanical heads known as styli to physically cut grooves in the recording medium, in a configuration (of size, width, depth and position) recoverable as sound.
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Famous quotes containing the words recording and/or head:
“He shall not die, by G—, cried my uncle Toby.
MThe ACCUSING SPIRIT which flew up to heaven’s chancery with the oath, blush’d as he gave it in;—and the RECORDING ANGEL as he wrote it down, dropp’d a tear upon the word, and blotted it out for ever.”
—Laurence Sterne (1713–1768)
“So long as you write what you wish to write, that is all that matters; and whether it matters for ages or only for hours, nobody can say. But to sacrifice a hair of the head of your vision, a shade of its colour, in deference to some Headmaster with a silver pot in his hand or to some professor with a measuring-rod up his sleeve, is the most abject treachery, and the sacrifice or wealth and chastity, which used to be said to be the greatest of human disasters, a mere flea-bite in comparison.”
—Virginia Woolf (1882–1941)