![]() Because of the similarity in magnetic characteristics between some disk types, it was possible to use an incorrectly certified disk in a soft sectored drive. ![]() GCR was also used on some platforms, but typically in a "double" density form.Ĩ- and 5 + 1 ⁄ 4-inch floppy disks were available with both soft sectoring and hard sectoring. Subsequent use of the term "density" referred to physical characteristics of the media, with MFM assumed to be the logical format used. Originally, single density and double density indicated a difference in logical encoding on the same type of physical media: FM for single, and MFM for double. The term density has a double meaning for floppy disks. ![]() ![]() TPI was not a part of the physical manufacturing process it was a certification of how closely tracks of data could be spaced on the medium safely. Logical and physical layout of data in a floppy diskĭifferent floppy disk types had different recording characteristics, with varying magnetic coercivity (measured in oersteds, or in modern SI units in amperes per meter), ferrite grain size, and tracks per inch (TPI). ![]()
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