SGV Tape Head Isolation Shield for Writer-Reader Crosstalk
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Solution Overview
Problem
Conventional tape heads require separate structures for writing and read-verifying data, leading to mis-registration issues due to tape skew and potential data loss from time delays between writing and verifying, especially when uncorrectable errors occur.
Innovation Solution
A tape head with a same gap verify (SGV) module that integrates write and read transducers within a single structure, utilizing an isolation shield to reduce cross-talk between them, allowing concurrent operation for writing and verifying data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate head structures are used for writing and read-verifying data, then read-verify function can be enabled, 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 write and verify functions. This merging allows both transducers to be positioned at the same gap location, ensuring they track the same tape position simultaneously and eliminating mis-registration issues caused by tape skew.
Solution Approach 2:
The patent introduces an isolation shield as an intermediary element positioned between the write transducer and read transducer. This shield acts as a magnetic barrier that prevents write flux from coupling to the read transducer, enabling simultaneous operation of both transducers without interference while maintaining their integrated position.
2Reliability
If separate head structures are used for writing and read-verifying data, then read-verify function can be enabled, but time delay between writing and verifying leads to data loss
Solution Approach 1:
By integrating both write and read transducers in the same head structure at the same gap position, the patent enables simultaneous operation. As the tape passes under the head, the write transducer writes data while the read transducer immediately verifies it, eliminating the time delay that occurs with separate head structures where verification happens after the tape has moved to a different position.
3Loss of time
If write and read transducers are positioned close together for simultaneous operation, then time delay is reduced, but cross-talk between writer and reader increases
Solution Approach 1:
The isolation shield serves as a magnetic intermediary barrier positioned between the write transducer and read transducer. It blocks the magnetic flux generated by the write transducer from reaching the read transducer, preventing cross-talk while allowing both transducers to operate simultaneously at the same gap position. The shield is configured to extend beyond the write transducer width to ensure complete isolation.
Solution Approach 2:
The patent applies local quality by making the isolation shield's width greater than the write transducer's width. This localized extension ensures that the shield provides sufficient magnetic isolation in the critical region where cross-talk would occur, while maintaining the compact integrated structure of the head assembly.
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
Enables precise and efficient data writing and verification within a single head structure, reducing mis-registration and data loss by allowing simultaneous operation of write and read transducers, thus improving data integrity and storage capacity.
Implementation Method 1
An isolation shield is disposed between the write transducer and read transducer such that the isolation shield is disposed between each writer lead and each reader lead. The isolation shield acts as a Faraday cage to reduce cross-talk between the write and read transducers.
Implementation Method 2
The magnetic write transducer then generates a magnetic field, which encodes the data into the magnetic media.
Implementation Method 3
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 plurality of write transducer and read transducer pairs. Each write transducer is coupled to writer bonding pads via writer leads, and each read transducer is coupled to reading bonding pads via reader leads. An isolation shield is disposed between the write transducer and read transducer such that the isolation shield is disposed between each writer lead and each reader lead. The isolation shield acts as a Faraday cage to reduce cross-talk between the write and read transducers. The SGV module is configured to write data to a tape using the write transducers and read verify the data written on the tape using the read transducers such that the write transducers and read transducers are concurrently operable.