Magnetic Head Offset Arrays for Tape Track Alignment
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Solution Overview
Problem
Tape lateral expansion and contraction pose challenges to increasing data track density in magnetic tape storage systems, as they lead to misregistration issues that limit areal density, and current methods fail to fully compensate for these changes without causing other problems like tape stretch and increased media costs.
Innovation Solution
A magnetic tape head system with two or more modules, each having an array of transducers, where the arrays are oriented at an angle greater than 0.2° relative to the tape travel direction, allowing for dynamic adjustment of transducer pitch to align with changing tape dimensions, using a controller to manage the orientation and ensure precise track alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of data tracks is increased to increase data storage capacity, then areal density is improved, but misregistration caused by tape lateral expansion and contraction becomes more severe
Solution Approach 1:
The patent makes the transducer array dynamically adjustable by introducing a mechanism that can change the pitch (spacing) between transducers in real-time. This allows the system to adapt to tape dimensional changes during operation, resolving the contradiction between increasing track density and maintaining alignment precision under varying tape conditions.
Solution Approach 2:
The patent changes the physical parameter of transducer pitch to compensate for tape expansion and contraction. By adjusting this parameter dynamically, the system maintains proper track alignment despite tape dimensional instability, enabling higher data density without sacrificing registration accuracy.
2Manufacturing precision
If the feature sizes of readers and writers are reduced to increase the number of tracks, then track density is improved, but tracking precision deteriorates due to tape dimensional instability
Solution Approach 1:
The patent introduces dynamic adjustability to the transducer array pitch, allowing real-time compensation for tracking errors caused by tape dimensional instability. This enables the system to maintain measurement precision even when using smaller feature sizes for higher track density.
Solution Approach 2:
The system uses feedback from tracking error detection to dynamically adjust transducer pitch, creating a closed-loop control system that maintains tracking precision despite tape expansion and contraction, thereby enabling higher track density without sacrificing precision.
3Reliability
If wider readers are used to improve signal-to-noise ratio, then readback quality is improved, but the transducer array width increases making alignment more difficult
Solution Approach 1:
The patent makes the transducer array pitch dynamically adjustable, allowing the system to compensate for the increased alignment complexity introduced by wider readers. This enables the use of wider readers for improved signal-to-noise ratio without making the alignment problem intractable.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables effective alignment of transducers with data tracks despite tape lateral expansion and contraction, improving data track density and capacity without causing media damage or increasing costs, by allowing for wider readers and smaller data tracks, thus enhancing signal-to-noise ratio and areal capacity.
Implementation Method 1
The magnetic recording transducer then generates a magnetic field, which encodes the data into the magnetic media
Implementation Method 2
Data is read from the media by similarly positioning the magnetic read transducer and then sensing the magnetic field of the magnetic media
Data Source
AI summary
A computer program product for orienting a head includes a computer readable storage medium having program instructions embodied therewith. The program instructions are readable and/or executable by a controller to cause the controller to: determine a desired pitch for transducers for reading and/or writing to a magnetic tape; and cause a mechanism to orient a head to achieve the desired pitch. The array of a first of the modules is offset from the array of a second of the modules in a first direction parallel to the axis of the array of the second module such that the transducers of the first module are about aligned with the transducers of the second module in the intended direction of tape travel thereacross when the axes are oriented at an angle greater than 0.2° relative to a line oriented perpendicular to the intended direction of tape travel.