Rotating media recording system with adaptive track density
AssigneeHitachi Global Storage Technologies Netherlands B.V.
InventorsTimothy J. Chainer, Edward J. Yarmchuk, Mark D. Schultz, Bucknell C. Webb
Life of this patent
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Abstract
A method for writing tracks on a rotating disk media data storage device comprising the steps of: receiving a set of component parameters; and adjusting track pitch for each of the tracks to be written in each disk according to the component parameters. According to another embodiment a disk drive includes at least one disk comprising a two or more of tracks in which the track pitch between each pair of adjacent tracks is set based on component parameters such as the recording head widths. According to another embodiment a servowriter is adapted to perform the method discussed above.
Claims38
A servowritng method for writing tracks on a rotating disk media data storage device, the method comprising the steps of:
- receiving a set of system parameters and component parameters, wherein the component parameters relate to components in a data storage device, wherein the data storage device comprises a plurality of surfaces, and wherein the set of system parameters and component parameters are not measured during a servowriting process;
- and
- adjusting a track pitch to be written on each surface within the plurality of surfaces according to at least one of the component parameters during the servowriting process, wherein the track pitch is adjusted for groups of surfaces within the plurality of surfaces.
A servowriting method for writing tracks on a rotating disk media data storage device, the method comprising the steps of:
- receiving a set of system parameters and component parameters, wherein the component parameters relate to components in a data storage device, wherein the data storage device comprises a plurality of surfaces, and wherein the component parameters comprise read head width;
- and
- adjusting a track pitch to be written on each surface within the plurality of surfaces according to at least one of the component parameters, wherein the track pitch is adjusted for each surface of within the plurality of surfaces.
A servowriting method for writing tracks on a rotating disk media data storage device, the method comprising the steps of:
- receiving a set of system parameters and component parameters, wherein the component parameters comprise variations in track misregistration and relate to components in each individual said data storage device;
- and
- adjusting the track pitch for each of the tracks to be written in each disk according to at least one of the component parameters.
A servowriting method of adapting the track pitch of a disk drive to the recording head widths comprising the steps of:
- measuring the gap between servo tracks during the servowriting process;
- and
- writing servotracks having a servo track pitch such as to maintain a gap between the data tracks.
A method of measuring the DC track squeeze between adjacent tracks rotating disk media storage devices comprising measuring the mean value of an overlap value, wherein the overlap value corresponds to the spacing between adjacent servo tracks.
A method of measuring the AC track squeeze between adjacent tracks comprising the steps of:
- measuring track overlap values at a plurality of radial locations on a recording surface;
- determining a mean value of the track overlap values;
- and
- subtracting the mean value from the track overlap values.
A method of servowriting a disk drive with variable track density comprising measuring an overlap value to maintain a predetermined gap between each pair of data tracks, wherein the overlap value corresponds to the spacing between adjacent servo tracks.
A method of servowriting a disk drive with variable track density, the method comprising:
- writing magnetic patterns in at least one radial position;
- measuring the read and write width from the readback profile of the magnetic patterns using an external positioner;
- and
- setting the track pitch for groups of heads to a value based on the measured read and write widths, wherein the groups of head comprise fewer heads than are contained within the disk drive, and wherein each group within the groups comprise heads with read and write widths within a specified range.
A disk drive comprising:
- a plurality of disks each comprising a plurality of tracks in which the track pitch between each pair of adjacent tacks is set for each disk of the plurality of disks based upon at least one component parameter relating to a component in the drive.
A disk drive comprising:
- a plurality of disks each comprising a plurality of tracks in which the track pitch between each pair of adjacent tracks is set based on at least one component parameter relating to a component in the drive, wherein data surfaces in the plurality of disks are grouped into different track densities based on the overlap value of the servo tracks, and wherein the overlap value is within a range and wherein each disk within a group has equal track density.
A disk drive comprising:
- a plurality of disks each comprising a plurality of tracks in which the track pitch between each pair of adjacent tracks is set for each disk of the plurality of disks based upon at least one component parameter relating to a component in the drive wherein the component parameters comprise read head width.
A disk drive comprising:
- a plurality of disk each comprising a plurality of tracks in which the track pitch between each pair of adjacent tracks is set based on at least one component parameter relating to a component in the drive, wherein the component parameters comprise variations in mechanical input noise.
A servowriter apparatus for writing tracks on a rotating disk media data storage device comprising:
- means for receiving a set to component parameters, wherein the component parameters comprise variations in mechanical input noise;
- and
- means for adjusting the track pitch for each of the tracks to be written in each disk according to at least one of the component parameters.
A disk drive comprising:
- a plurality of disks each comprising a plurality of tracks in which a the track pitch between each pair of adjacent tracks is set to a value for fewer than all of the disks within the plurality of disks, wherein each of the disks within the fewer than all of the disks have at least one component parameter value that is unequal and within a specified range.
Dependencies are inferred from the claim text.