Rotary Head Data Storage Bulk Erasure Verification
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Solution Overview
Problem
Existing tape media data storage systems face inefficiencies in accessing data at the end of longer tapes, limited storage capacity, and time-consuming data erasure processes, particularly due to the limitations of multiple stripe head designs and the inability to perform bulk data erasure in optical recorders.
Innovation Solution
A rotary head system with multiple optical heads on a rotating carriage assembly that can write and read data tracks simultaneously, allowing for bulk data erasure without the need for additional read heads, thereby enhancing data throughput and meeting strict security requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple stripe head designs are used to increase storage capacity, then tape width and number of tracks increase, but access time to data at the end of the tape increases significantly
Solution Approach 1:
The patent transitions from linear data access (single head moving along tape length) to two-dimensional access (rotary head with multiple elements positioned at different radial locations). This allows simultaneous access to multiple tracks across the tape width, effectively adding a spatial dimension to data retrieval and reducing access time while maintaining high storage capacity.
Solution Approach 2:
The rotary head is segmented into multiple independent head elements (e.g., 4-16 elements) positioned at different radial locations. Each element can independently read/write different tracks simultaneously, dividing the data access task across multiple parallel channels, thereby reducing overall access time while maintaining high storage capacity.
2Productivity
If magnetic bulk erasure is used to erase large volumes of data, then erasure speed improves, but data security verification becomes time-consuming due to required read-after-erase cycles
Solution Approach 1:
The patent combines the erasure function and verification function into a single integrated process. The same rotary head elements that write erasure patterns also read and verify the erasure in real-time during the same tape pass, merging two separate operations into one concurrent process, thereby eliminating additional verification time.
Solution Approach 2:
The verification process occurs continuously during the erasure operation itself, rather than as a separate subsequent step. The rotary head continuously writes erasure patterns and simultaneously verifies them as the tape passes, maintaining continuous useful action throughout the process and eliminating idle verification time.
3Quantity of substance
If optical recorders use phase-change media for data storage, then storage capacity and durability improve, but bulk data erasure capability is lost
Solution Approach 1:
The patent replaces the thermal phase-change mechanism (which lacks bulk erasure capability) with a mechanical/optical pattern-writing mechanism. The rotary head physically writes over existing data with new patterns (erasure sequences) using optical elements, substituting the thermal field effect with a direct mechanical/optical writing process that enables bulk erasure while maintaining phase-change media benefits.
Solution Approach 2:
The rotary head elements serve multiple functions: they can write user data, write erasure patterns, and verify both user data and erasure patterns. This multi-functionality allows the system to maintain phase-change media advantages while gaining bulk erasure capability through the same hardware components.
4Reliability
If additional dedicated read heads are added to enable bulk data erasure verification, then verification capability improves, but device complexity and cost increase
Solution Approach 1:
The rotary head elements are designed to be universal, capable of both writing and reading operations. The same physical elements that write erasure patterns can also read and verify them, eliminating the need for separate dedicated read heads. This multi-functionality reduces device complexity while maintaining verification capability.
Solution Approach 2:
The write heads serve themselves by performing both the erasure writing and the subsequent verification reading. The system uses its own existing components for dual purposes, eliminating the need for additional specialized components and reducing overall system complexity.
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 rotary head system improves data access times, increases storage capacity, and efficiently performs bulk data erasure while meeting stringent security standards by utilizing existing write heads in a read mode, reducing complexity and cost.
Implementation Method 1
a first one of the plurality of optical heads is configured to write a data track on the tape
Implementation Method 2
a second one of the plurality of optical heads is configured to thereafter read the data track
Data Source
AI summary
A data storage and retrieval system includes a head carriage unit adapted for rotational motion and having multiple heads disposed at a working surface, the head carriage unit adapted for rotational motion. The system also includes a tape drive unit configured to move a tape media past the working surface of the head carriage unit, the tape media having a width approximately equal to a width of the working surface of the head carriage unit. As the head carriage unit rotates and the tape moves past the working surface, a first head is configured to write a data track on the tape and a second head is configured to thereafter read the data track, where data read by the second head is for use in verifying data erasure.