Magnetic properties
Magnetic recording relies on the use of hard ferrimagnetic or ferromagnetic materials. These require strong external magnetic fields to be magnetized, and retain substantial See more

Type I, or IEC I, ferric or 'normal' cassettes were historically the first, the most common and the least expensive; they dominated the prerecorded cassette market. The … See more

Metal particle Type IV
Pure metal particles have an inherent advantage over oxide particles due to 3–4 times higher remanence, very high coercivity and far … See more

The original specification for Compact Cassette was set by Philips in 1962–1963. Of the three then available tape formulations that … See more

IEC Type II tapes are intended for recording using high (150% of normal) bias and replay with the 70 μs time constant. All generations of Type II reference tapes, including the 1971 DIN reference that pre-dated the IEC standard, were manufactured by … See more

In 1973, Sony introduced double-layer ferrichrome tapes having a five-micron ferric base coated with one micron of CrO2 pigment. The new … See more

During the many years that cassette decks were popular, many audio magazines published comparative measurements of the performance … See more