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US 7,072,133 B1Granted
Servo mark verify head
AssigneeImation Corp.
InventorsYung Yip, Stephen J. Rothermel
Life of this patent
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Abstract
The invention presents techniques for verifying patterns, such as time-based servo marks, recorded on magnetic media. Patterns of this kind can be recorded on a magnetic medium using a recording head that includes a surface having a flux gap with a defined shape. The patterns may be verified with a verify head, having a surface with a flux gap with the defined shape or part of the defined shape. The verify head may include two or more ferromagnetic cores, with a flux gap associated with each core. Each core can independently verify part of the recorded pattern.
Claims24
A device comprising:
- a first ferromagnetic core including a first core gap;
- a second ferromagnetic core separated from the first ferromagnetic core by a space, the second ferromagnetic core including a second core gap;
- a first magnetically permeable surface proximate to the first ferromagnetic core;
- and
- a second magnetically permeable surface proximate to the second ferromagnetic core, wherein the first magnetically permeable surface includes a first flux gap associated with the first core gap and the second magnetically permeable surface includes a second flux gap associated with the second core gap, wherein the first flux gap and the second flux gap define at least a portion of a time-based servo pattern and wherein the first flux gap is at least partially non-parallel to the second flux gap.
2 more elements
A method comprising:
- recording a time-based servo pattern to a magnetic medium using a recording head, the recording head including a first surface patterned with a first set of flux gaps to define a defined shape that corresponds to the time-based servo pattern;
- and
- sensing the time-based servo pattern on the magnetic medium using a verify head, the verify head including a second surface patterned with a second set of flux gaps to define substantially the defined shape that corresponds to the time-based servo pattern wherein the recording head and the verify head are substantially identical in construction,
- wherein the defined shape comprises at least one first portion that is neither parallel to a path of the medium past the heads nor a direction transverse to the path of the medium past the heads and at least one second portion that is at least partially non-parallel to the first portion.
1 more element
A system comprising:
- a recording head, the recording head including a first surface comprising a first set of flux gaps that form a first defined shape, wherein the first defined shape corresponds to at least a portion of a time-based servo pattern;
- and
- a verify head, the verify head including a second surface comprising a second set of flux gaps that form a second defined shape substantially similar to the first defined shape of the first set of flux gaps in the record head,
- wherein each of the first and second defined shapes comprise at least one first portion that is neither parallel to a path of a magnetic medium past the heads nor a direction transverse to the path of the magnetic medium past the heads and at least one second portion that is at least partially non-parallel to the first portion.
1 more element
A device comprising:
- a first ferromagnetic core having a first core gap;
- a second ferromagnetic core having a second core gap;
- a first magnetically permeable surface proximate to the first ferromagnetic core having a first flux gap associated with the first core gap, the first flux gap having a first defined shape;
- and
- a second magnetically permeable surface proximate to the second ferromagnetic core having a second flux gap associated with the second core gap, the second flux gap having a second defined shape, the second defined shape being distinct from the first defined shape in at least one of contour and orientation such that the first and second flux gaps collectively define a time-based servo pattern to be created on a magnetic medium.
2 more elements
A system comprising:
- a recording head, the recording head including a first surface comprising a first set of flux gaps that form a defined shape, wherein the defined shape corresponds to at least a portion of a time-based servo pattern;
- and
- a first verify head, the first verify head including a second surface comprising a first flux gap that defines a first part of the defined shape;
- and
- a second verify head the second verify head including a third surface that defines a second part of the defined shape,
- wherein the defined shape comprises at least one first portion that is neither parallel to a path of a magnetic medium past the heads nor a direction transverse to the path of the magnetic medium past the heads and at least one second portion that is at least partially non-parallel to the first portion.
3 more elements
Dependencies are inferred from the claim text.