Dedicated Erase Transducer for Rapid HDD Data Removal
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Solution Overview
Problem
Current methods for securely erasing data from hard disk drives (HDDs) are either wasteful or inefficient, as physical destruction generates waste, bulk degaussing can damage servo marks, and self-erasure is time-consuming and leaves residual magnetic fields that may allow data recovery.
Innovation Solution
A data storage device with a dedicated erase transducer that is physically and electrically separate from the write transducer, featuring a larger crosstrack width to simultaneously erase multiple tracks, significantly improving erasure efficiency and speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If self-erasure is used to erase data from HDD, then data can be erased without physical destruction, but the process is time-consuming (15 hours for 10 TB HDD) and leaves residual magnetic fields that may allow data recovery
Solution Approach 1:
The invention segments the erasure function from the write function by providing a dedicated erase transducer separate from the write transducer. This dedicated erase transducer is optimized specifically for erasure operations, enabling faster and more reliable erasure without the time constraints and residual field issues of using the write transducer for erasure.
Solution Approach 2:
The erase transducer operates at different magnetic field parameters compared to the write transducer. It uses higher current densities and different pulse characteristics optimized for complete magnetic domain reversal and erasure, achieving thorough data destruction in much shorter time without leaving recoverable residual fields.
2Loss of time
If bulk degaussing is used to erase data from HDD, then data erasure is fast, but servo marks are damaged and the drive becomes inoperable
Solution Approach 1:
The erase transducer provides localized erasure control, allowing selective erasure of specific track regions without affecting the entire disk. The magnetic field is concentrated precisely where needed, enabling complete data erasure while preserving servo marks and other critical disk structures that maintain drive functionality.
Solution Approach 2:
The erase transducer uses controlled magnetic field parameters that are sufficient for data erasure but precisely managed to avoid the extreme field strengths of bulk degaussing that would damage servo marks. This allows fast erasure while maintaining drive operability.
3Reliability
If physical destruction is used to erase data from HDD, then data security is guaranteed, but the drive is rendered inoperable and generates waste
Solution Approach 1:
The erasure function is extracted as a separate, dedicated capability from the write function. By providing a specialized erase transducer, the system can perform complete data erasure without physical destruction, maintaining drive integrity and enabling reuse while ensuring data security.
Solution Approach 2:
The HDD performs its own data erasure using the integrated erase transducer, eliminating the need for external physical destruction methods. The drive can securely erase its own data and remain functional for reuse, combining data security with resource sustainability.
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 secure and rapid erasure of data, reducing the time required to erase a 10 TB HDD from 15 hours to approximately 18 minutes, while preserving servo marks and allowing for the reuse of HDDs.
Implementation Method 1
A data storage device with a dedicated erase transducer that is physically and electrically separate from the write transducer, featuring a larger crosstrack width to simultaneously erase multiple tracks
Implementation Method 2
The magnetic erase transducer has a second crosstrack width operable to simultaneously erase multiple tracks of data from the magnetic disk
Data Source
AI summary
A recording head has a magnetic write transducer having a first crosstrack width operable to write a single track of data at a time to a magnetic disk. The recording head also has a magnetic erase transducer separate from the magnetic write transducer. The magnetic erase transducer has a second crosstrack width operable to simultaneously erase multiple tracks of data from the magnetic disk.