Partial Write System for Shingled Magnetic Recording Media
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Solution Overview
Problem
In magnetic media storage, the increased data storage density through shingled magnetic recording (SMR) leads to challenges in random write operations due to the strong write field affecting adjacent cells, necessitating inefficient full-band re-write operations to update data, which are time-consuming and power-intensive.
Innovation Solution
Implementing a partial read-modify-write operation that allows data updates by reading and writing only the necessary tracks within a data band, using a media controller to manage the process and store data in a temporary scratch pad, enabling efficient updates without affecting adjacent tracks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If shingled magnetic recording is used to increase data storage density, then storage capacity is improved, but random write operations become problematic due to strong write fields affecting adjacent cells
Solution Approach 1:
The data band is segmented into multiple tracks with guard tracks separating them. The write operation is confined to a specific track segment, preventing the write field from affecting adjacent tracks. This segmentation allows high storage density while maintaining write isolation through the guard track boundaries.
Solution Approach 2:
The write field strength and distribution are optimized locally for each track. Guard tracks are strategically positioned to create local isolation zones. The write head parameters are adjusted to concentrate the write field precisely within the target track boundaries, ensuring that adjacent cells remain unaffected while maintaining high storage density.
2Reliability
If full-band re-write operations are performed to update data, then data integrity is maintained, but operation time and power consumption increase
Solution Approach 1:
Instead of performing full-band re-write operations, the system implements partial write operations that update only the specific track or sector containing the modified data. The media controller identifies the exact location of changes and applies write operations only to those regions, maintaining data integrity while significantly reducing operation time and power consumption compared to rewriting entire bands.
Solution Approach 2:
The system extracts and updates only the modified portions of data rather than processing the entire band. The media controller identifies changed sectors and isolates them for targeted update operations, leaving unchanged data intact. This extraction approach maintains data integrity while eliminating unnecessary write operations that consume time and power.
3Reliability
If full-band re-write operations are performed to update data, then data integrity is maintained, but power consumption increases
Solution Approach 1:
The system performs partial write operations updating only the specific tracks or sectors that contain modified data. The media controller identifies the exact scope of changes and limits write operations to those regions only. This partial action approach maintains data integrity while significantly reducing power consumption compared to full-band re-write operations that would consume excessive energy.
Solution Approach 2:
The system extracts only the modified data portions from the full band for update operations. By identifying and isolating changed sectors, the system performs write operations only on extracted modified regions, maintaining data integrity while minimizing power consumption by avoiding unnecessary write operations on unchanged data.
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
This approach reduces the time and power consumption required for data updates by minimizing the data read and written, improving storage device efficiency and cell density without overwriting adjacent cells.
Implementation Method 1
Magnetic media storage drives store data in polarized cells on one or more magnetized media within each storage drive
Implementation Method 2
The write pole generates a magnetic field that writes data to a disc by changing the magnetic polarization of the cells on the disc
Implementation Method 3
The read pole reads data from the disc by detecting the magnetic polarization of the cells on the disc
Data Source
AI summary
A method and system can be implemented to perform a read-modify-write operation on data recorded in a shingled media format. In one embodiment, a write operation on a band of data stored on a magnetic recording medium is initiated at an intermediate position within the band of data. This is particularly well-suited for data written by a shingled media write operation.