Tape Storage Interval Marker Data Writing
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Solution Overview
Problem
Existing tape storage devices face inefficiencies in data writing, particularly when the data input rate from a host is lower than the tape's capacity, leading to complex control requirements for tape transportation and potential decreases in data density due to back hitching and variable-speed recording.
Innovation Solution
A controller is used to write data stored in a buffer to a recording medium in a first round, followed by writing an interval marker, and then subsequent data is written after the marker in the same round, with further data written in the area of the marker in subsequent rounds, allowing for constant-speed tape transportation and reduced complex control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If tape transportation is stopped and rewound (back hitched) when data input rate is lower than writing capacity, then data can be recorded sequentially, but device complexity and control requirements increase
Solution Approach 1:
The patent applies preliminary action by pre-writing interval markers at predetermined positions before actual data writing. These markers serve as placeholders that guide subsequent data writing operations, eliminating the need for complex real-time control decisions about when to stop, rewind, or change speed. The controller simply writes data after the current interval marker and uses the markers to maintain proper data distribution across tracks.
2Quantity of substance
If tape transportation speed is reduced for dense recording, then data density increases, but manufacturing precision and recording quality may deteriorate
Solution Approach 1:
The patent applies parameter changes by maintaining constant tape transportation speed throughout the recording process, eliminating variable-speed recording. Data density is controlled through the strategic placement of interval markers and multi-round writing strategies rather than speed variation. This maintains recording precision while achieving desired data density through parameter optimization of marker intervals and writing rounds.
3Manufacturing precision
If interval markers are written in the same track as data, then data distribution across tracks is improved, but track overflow may occur
Solution Approach 1:
The patent applies segmentation by dividing the recording process into multiple rounds and using interval markers to segment data writing within tracks. When a track approaches capacity, the system transitions to writing in subsequent tracks rather than allowing overflow. The interval markers act as segment boundaries that organize data distribution across multiple tracks, ensuring uniform distribution while maintaining reliable capacity management through structured segmentation.
Data Source
AI summary
A method, and apparatus configured to perform such method, according to various embodiments, includes writing data stored in a buffer onto a recording medium using a write head in a first round of writing. An interval marker is written on the recording medium in the first round of writing when the buffer is empty. Next data is written onto the recording medium after the interval marker in the first round of writing. Data is written in an area of the interval marker in a second round of writing performed subsequent to the first round.