Dual Pass Perpendicular Magnetic Recording
OwnerWilliam Hainesinventor
Life of this patent
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Abstract
Dual Pass Perpendicular Magnetic Recording is an invention to increase the storage capacity of disk drives and provides faster data transfer when reading data from a disk drive operating in this mode. By using two passes of the recording head to write a data track, more magnetic states are created than in conventional or shingled magnetic recording. This allows a higher storage capacity to be achieved.
Claims24
A magnetic data storage system comprising:
- a magnetic recording head, a moving magnetic recording medium, positioning systems that can move the writing and reading elements accurately in the cross track direction and a read/write recording channel (controller) that controls the recording and read back of data from the magnetic recording medium, wherein a data track is written in two passes of the recording element with the second pass displaced in the cross track direction from the first pass by a partial track width
The storage system as recited in claiml where data may be stored in three different modes including a conventional mode where data is written in one pass of the recording head, a shingled mode where the track width is trimmed by writing an adjacent track on one side only at a spacing less than the write width of the head and, a third mode where the data is written in two passes of the recording head with the second pass being offset from the first pass by a distance less than the track width
A method, comprising:
- receiving data to be written to a magnetic medium, wherein adjacent flux transitions in the magnetic medium are arranged in a staggered orientation such that any two centers of the adjacent flux transitions do not lie along a common line in a cross-track direction;
- organizing the data to be written successively to adjacent flux transitions of the magnetic medium such that the data is reproducible when read back from the adjacent flux transitions concurrently;
- and writing the data successively to the adjacent flux transitions, wherein the data is written such that data in adjacent flux transitions is staggered.
A magnetic data storage device that provides three or more modes of data storage with successively increasing densities of storage with one of the modes being Dual Pass Perpendicular Recording.
Dependencies are inferred from the claim text.