Tape-creep detection via trajectory and distortion angles
AssigneeInternational Business Machines Corporation
InventorsDaniel James Winarski, Nhan Xuan Bui, Lee Curtis Randall, Richard Bradshaw
Life of this patent
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Abstract
A tape drive may calculate the slopes for three successive timing-based-servo marks in a timing-based-servo group. The timing-based-servo marks may be arranged in a one or more M-patterns. The three successive timing-based-servo marks may be across the one or more M-patterns. The tape drive may perform a parabolic fit of a gradient of the slopes. The tape drive may determine whether the gradient is demonstrative of tape-creep.
Claims20
A method for allowing a tape drive to write to a tape cartridge with timing-based-servo marks, the method comprising:
- calculating slopes for three successive timing-based-servo marks in a timing-based-servo group, wherein the timing-based-servo marks are arranged in one or more M-patterns, and wherein the three successive timing-based-servo marks are across the one or more M-patterns;
- performing a parabolic fit of a gradient of the slopes;
- determining whether the gradient is demonstrative of tape-creep;
- and
- writing, from the tape drive, to the tape cartridge.
A system comprising:
- a tape drive;
- and
- a tape cartridge with timing-based-servo marks, wherein the tape drive writes to the tape cartridge, and wherein the tape drive is configured to perform the operations comprising:
- calculating slopes for three successive timing-based-servo marks in a timing-based-servo group, wherein the timing-based-servo marks are arranged in one or more M-patterns, and wherein the three successive timing-based-servo marks are across the one or more M-patterns;
- performing a parabolic fit of a gradient of the slopes;
- and
- determining whether the gradient is demonstrative of tape-creep.
Dependencies are inferred from the claim text.