Patent ID: 6457096
Filing Date: 2002-09-24
Classification: G06F,G11B

Abstract:
A redundant recording disk device comprising:a plurality of disks operable to rotate in synchronization with each other around respective rotation axes; a plurality of recording heads respectively corresponding to said plurality of disks operable to write data to and read data from a first logical recording surface and a second logical recording surface among said disks, wherein the data includes data 1 to data n, where n is an integer not less than one; and control means for: detecting and controlling positions of said recording heads on said first and second logical recording surfaces; controlling the writing and reading of the data; when the data 1 to data n is written, controlling writing such that the data 1 to data n is duplicated into first mirrored data 1 to first mirrored data n and second mirrored data 1 to second mirrored data n and the first mirrored data 1 to first mirrored data n is written into a plurality of consecutive sector positions, respectively, at a radius on said first logical recording surface and the second mirrored data 1 to second mirrored data n is written into a plurality of consecutive sector positions, respectively, at the radius on said second logical recording surface, wherein the plurality of consecutive sector positions have a predetermined phase difference around the rotation axes of said disks, and the plurality of consecutive sector positions on said second logical recording surface are offset by a predetermined phase-offset from the plurality of consecutive sector positions, respectively, on said first logical recording surface; and when data i to data j from the data written on said first and second logical recording surfaces is designated by a command to be read, where i is an integer not less than one, j is an integer, and i