SGV Tape Head Overcoat Design for Data Verification
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Solution Overview
Problem
Conventional tape heads require separate structures for writing and read-verifying data, which are prone to mis-registration due to tape skew and result in potential data loss from uncorrectable errors, as they cannot write and read verify data within a single head structure effectively.
Innovation Solution
A tape head with a same gap verify (SGV) module comprising a closure, substrate, and pairs of write and read transducers aligned in a specific direction, where each transducer is coated with different overcoats of varying thicknesses, allowing for simultaneous data writing and read verification within a single head structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If separate head structures are used for writing and read-verifying data, then data storage capacity can be increased through track overlapping, but mis-registration between reader and writer occurs due to tape skew
Solution Approach 1:
The patent combines the write transducer and read transducer into a single integrated head structure, eliminating the separation between writing and read-verify functions. This merging allows both transducers to share the same positioning reference, preventing mis-registration due to tape skew while maintaining the ability to perform track overlapping for increased storage capacity.
2Quantity of substance
If separate head structures are used for writing and read-verifying data, then data storage capacity can be increased through track overlapping, but time delay occurs between writing and read-verifying leading to data loss
Solution Approach 1:
By integrating the read transducer with the write transducer in the same head structure, the patent enables immediate read-verify of newly written data without the time delay associated with separate head structures. This eliminates the risk of data loss due to tape movement during the verification delay, while still allowing track overlapping for increased storage capacity.
3Quantity of substance
If separate head structures are used for writing and read-verifying data, then data storage capacity can be increased, but the head assembly becomes more complex and difficult to assemble
Solution Approach 1:
The patent integrates the read transducer and write transducer into a single head structure, reducing the number of separate components that must be precisely assembled. This merging simplifies the head assembly process while maintaining the capability for track overlapping and increased data storage capacity.
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
The SGV module enables precise alignment and reduced susceptibility to tape skew, minimizing data loss by allowing immediate read verification during writing, thus enhancing data storage reliability and efficiency.
Implementation Method 1
The magnetic write 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
The present disclosure generally relates to a tape head and a tape head drive including a tape head. The tape head comprises at least one same gap verify (SGV) module comprising a closure, a substrate, and a plurality of write transducer and read transducer pairs disposed between the substrate and the closure. The write transducer and the read transducer of each pair are aligned in a first direction and spaced a distance in the downtrack direction of about 5 μm to about 20 μm. A first overcoat is disposed over each write transducer at a media facing surface (MFS), and a second overcoat is disposed over each read transducer at the MFS. The first and second overcoats may comprise different materials, and are deposited during different processes.