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US 6,275,455 B1Granted
System and method for generating position error signals within a computer memory device
AssigneeSeagate Technology LLC
InventorKarl A. Belser
Life of this patent
Estimating the term…
Abstract
A system and method for generating position error signals within a magneto-optical computer memory device whose track pitch is close to the full width half maximum width of the laser spot, the narrow track being typical of data stored on magnetic super resolution media. The magneto-optical computer memory device comprises a storage media for storing information, position marks embossed on the storage media, a head device coupled to the storage media for sensing the position marks to generate position error signals, and a correction device coupled to the head device to access the position error signals and responsively position the head device to correctly sense the stored information.
Claims15
A data storage system comprising:
- a storage media, wherein said storage media includes position marks and tracks, wherein said position marks are disposed along said tracks, wherein said tracks have a center axis, wherein said tracks have a perpendicular first direction from said center axis, and wherein said tracks have an opposing perpendicular second direction from said center axis;
- a head device for directing a light beam towards said position marks and for sensing a reflection of said light beam from said position marks, wherein said light beam comprises an optical spot having a full width half maximum (FWHM) diameter associated therewith, said tracks being adjacently disposed on said storage media with a distance between said adjacently disposed tracks that is approximately FWHM diameter plus a tracking misregistration width;
- and
- a correction device coupled to said head device for detecting said reflection of said light and to generate position error signals from said reflection of said light and to adjust said head device over said storage media based on said position error signals.
1 more element
A storage media comprising:
- tracks and position marks, wherein said tracks are adjacently disposed on said storage media with a distance between said adjacently disposed tracks that is approximately a full width half maximum (WE) diameter of an optical spot of a light beam directed at said position marks, said tracks comprising a center axis, said position marks comprising synchronization marks, “A” error marks, and “B” error marks, wherein said tracks may be identified by sequential whole numbers;
- wherein said tracks comprise sequential track pairs having adjacent odd-numbered tracks and even-numbered tracks;
- wherein each one of said odd-numbered tracks sequentially includes:
- one of said synchronization marks positioned directly on said center axis of said odd-numbered track,
- an odd “A” error mark positioned a perpendicular distance from said center axis of said odd-numbered track in said first direction, and
- an odd “B” error mark positioned said perpendicular distance from said center axis of said odd-numbered track in said second direction;
- wherein each one of said even-numbered tracks sequentially includes:
- one of said synchronization marks positioned directly on said center axis of said even-numbered track,
- an even “A” error mark positioned a perpendicular distance from said center axis of said even-numbered track in said first direction;
- an even “B” error mark positioned said perpendicular distance from said center axis of said even-numbered track in said second direction;
- and
- wherein said even “A” error mark being perpendicularly adjacent to said odd “B” error mark in said first direction, and said even “B” error mark being perpendicularly adjacent to said odd “A” error mark in said second direction.
9 more elements
A storage media comprising:
- tracks and position marks, wherein said tracks are adjacently disposed on said storage media with a distance between said adjacently disposed tracks that is approximately a full width half maximum (FWHM) diameter of an optical spot of a light beam directed at said position marks, said tracks comprising a center axis, said position marks comprising synchronization marks, “A” error marks, and “B” error marks, wherein said tracks may be identified by sequential whole numbers;
- wherein said tracks comprise sequential track pairs having adjacent odd-numbered tracks and even-numbered tracks;
- wherein each one of said odd-numbered tracks sequentially includes:
- one of said synchronization marks positioned directly on said center axis of said odd numbered track,
- an odd “A” error mark positioned a perpendicular distance from said center axis of said odd-numbered track in said first direction, and
- an odd “B” error mark positioned said perpendicular distance from said center axis of said odd-numbered track in said second direction;
- wherein each one of said even-numbered tracks sequentially includes:
- one of said synchronization marks positioned directly on said center axis of said even-numbered track,
- an even “A” error mark positioned a perpendicular distance from said center axis of said even-numbered track in said first direction;
- an even “B” error mark positioned said perpendicular distance from said center axis of said even-numbered track in said second direction;
- and
- wherein said odd and even numbered tracks are equidistant about a midpoint therebetween, and wherein said even “B” mark and said odd “A” mark overlaps said midpoint, and wherein said even “A” mark and said odd “B” mark overlaps said midpoint.
9 more elements
Dependencies are inferred from the claim text.