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| Magnified several hundred times,
this copper coil is part of the "thin film"
recording head used in several IBM disk files. It
was introduced in 1980. The IBM 3380 file used the
technology to read and write data at three million
characters a second, the first commercial unit to
achieve such a rate. (Light refraction from minutely
separated film layers produced the iridescent color
pattern seen here.) |
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