Patent ID: 6104579
Filing Date: 2000-08-15
Classification: G11B

Abstract:
A magnetic disk for recording and reproducing data in conjunction with a magnetic head mounted in a floating head slider, said disk having at least one data record zone and at least one control signal zone formed radially thereon in the form of irregularities across the disk surface,wherein,said irregularities are configured to have an irregularity ratio such that said head slider flies at a first height DD-.DELTA.d above said disk surface when passing over the control signal record zone and at a second height DD above said disk surface when flying over said disk record zone and said first height is less than said second height but greater then a glide height GH,a ratio of the ratio of irregularities on said data record zone to the ratio of irregularities on said control signal record zone is 1.2 or less,.DELTA.d is the difference between DD and the flying height of the slider above the data record zone when flying over the control signal zone;GH is the height of the slider over the data record zone just prior to contact of the magnetic head with the disk surface; andspacing loss over said control signal zone is minimized such that effective amplitudes of magnetic signals read out from said control signal zone are equal to or greater than said effective amplitudes of magnetic signals read out from said data record zone.