Patent ID: 6295176
Filing Date: 2001-09-25
Classification: G11B

Abstract:
Disc drive apparatus comprising:a rotatable disc having a plurality of concentric data tracks arranged in a plurality of servo spokes and a plurality of data wedges separated by respective servo spokes, each wedge containing a plurality of data sectors, at least some data sectors being split by a servo spoke into fragments such that respective fragments of a split data sector are in different wedges, each track being characterized by an absence of sector identification and sector defect data, each servo spoke providing a servo gate signal;a transducer confronting the disc and operable to transfer data between a sector of the track confronting the transducer and a processor;track management apparatus for identifying the layout of data sectors on a selected track, the track management apparatus includingmeans identifying the number of bytes in each wedge on each track of the disc,a first counter for incrementing a count of bytes in a wedge,a second counter responsive to the first counter identifying a count equal to the number of bytes in a data sector to increment a count of data sectors on the track, andwedge calculation apparatus responsive to the data sector count and to the byte count to calculate the layout of data sectors in the current data wedge; andsector identification apparatus responsive to the wedge calculation apparatus to identify the sector currently confronting the transducer.