Magnetic Tape Rewinding Control for Long-Term Deformation Recovery
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Solution Overview
Problem
Magnetic tapes experience deformation during long-term storage, leading to recording and reproduction failures due to the magnetic head deviating from the target track position, which is exacerbated by high capacity and narrow track widths.
Innovation Solution
A magnetic tape control system that performs pre-rewinding storage followed by post-rewinding storage, reversing the ends of the tape to counteract deformation by changing the direction of creep deformation, ensuring accurate recording and reproduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If magnetic tape is stored for long-term archive, then data storage duration is extended, but tape deformation occurs causing recording and reproduction failures
Solution Approach 1:
The patent implements periodic rewinding operations at predetermined intervals during long-term storage. The rewinding control unit performs rewinding at specific time points (e.g., every 6 months or 1 year) to counteract cumulative deformation effects, thereby maintaining tape reliability over extended storage periods without requiring continuous monitoring or intervention.
2Quantity of substance
If magnetic tape capacity is increased with narrower track widths, then data storage density is improved, but tape deformation causes magnetic head deviation from target track position
Solution Approach 1:
The patent performs preliminary rewinding operations before the tape deformation becomes severe enough to cause magnetic head deviation. By proactively rewinding at predetermined intervals, the system prevents cumulative deformation from reaching critical levels that would compromise track position accuracy on high-density tapes with narrow track widths.
3Stability of the object's composition
If magnetic tape is wound around reel for storage, then tape is protected and organized, but deformation occurs during storage period
Solution Approach 1:
The patent applies periodic rewinding actions to counteract the deformation that naturally occurs during reel storage. By rewinding the tape at predetermined intervals, the system periodically resets the tape's mechanical state, preventing permanent deformation while maintaining the protective reel storage structure.
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 system effectively suppresses recording and reproduction failures by restoring the tape to a pre-deformed state, maintaining data integrity during long-term storage.
Implementation Method 1
as a storage period increases, the magnetic tape tends to be easily deformed
Data Source
AI summary
Provided are a magnetic tape control system that executes pre-rewinding storage of storing a magnetic tape in a state of being wound around a reel, and post-rewinding storage of storing the magnetic tape in a state of being rewound around a reel different from or the same reel as the reel after the pre-rewinding storage such that an end that is a tape outside end during the pre-rewinding storage is turned into a tape inside end and an end that is a tape inside end during the pre-rewinding storage is turned into a tape outside end, and a magnetic tape control device including a rewinding control unit that transmits rewinding execution information, and a drive unit that receives the rewinding execution information and starts running of a magnetic tape stored in a state of being wound around a reel to execute rewinding of the magnetic tape.