| 摘要 |
<p>A magnetic disk file for storing data on a rotating magnetic disk (10) having concentric recording tracks includes where a first inner group (16) of tracks (14) is recorded at one frequency f1, providing optimum track capacity for these tracks, and a second outer group (17) of tracks (15) are recorded at a second higher frequency f2, which also provides optimum track capacity for these tracks. At each address position, each of two magnetic transaucers (11, 12) is associated with a track from different groups. During the writing or reading of serial-by-byte data, the two tracks are transduced on successive revolutions. Suitable switching circuitry for switching from one transducer to the other in track is provided and also for changing the clock frequency. The system further inclues suitable disk formatting circuitry for converting the two physical tracks into one (or more) logical tracks having equal byte capacity.
<??>The method of transducing includes the steps of switching an index from one transducer to the other and adjusting the clock frequency accordingly, so that all logical records have the same capacity. The magnetic disk may be divided into more than two groups of tracks, if desired. </p> |
