Definition: MFM (Multiple Frequency Modulation)


A method of encoding analog signals into magnetic pulses or bits.




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Data Recovery Fact

Platter

The actual storage media in the different types of disks. In a hard drive the platter haa a core of glass or aluminium covered with a thin layer of Ferric oxide or a Cobalt alloy (Co-Ni, Co-Cr, Co-Ni-W). This layer is protected by a layer of a very hard material (overcoat), and a thin layer of lubricant. A CD is a plastic disc in which the data is impressed. It has a metallic, reflecting backside.

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