Shingled Magnetic Recording Track Pitch Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Shingled magnetic recording (SMR) data storage devices face challenges in maintaining data integrity and reliability due to non-uniform magnetic recording across the medium, particularly during random data writes, which can lead to increased bit error rates and reduced data capacity.
Innovation Solution
The solution involves adjusting the track pitches of data tracks on a data storage medium from a uniform initial pitch to multiple adjusted pitches, with wider pitches at the band edges and narrower pitches towards the center, to optimize data access performance and reduce errors associated with random writes, using a local or remote controller to test and configure track pitches based on operational parameters like bit error rate and adjacent track interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If uniform track pitch is used across the data band, then manufacturing is simplified and device complexity is reduced, but data integrity deteriorates during random writes due to non-uniform magnetic recording effects
Solution Approach 1:
The patent applies local quality by varying the track pitch across different regions of the data band. Specifically, tracks near the band edges have wider spacing while tracks near the center have narrower spacing. This non-uniform track pitch configuration compensates for non-uniform magnetic recording effects that occur during random writes, thereby improving data integrity in regions that previously suffered from adjacent track interference and other magnetic disturbances.
2Quantity of substance
If track pitch is reduced to increase data capacity, then areal density increases, but adjacent track interference increases causing higher bit error rates
Solution Approach 1:
The patent implements local quality by applying different track pitch values to different regions of the data band. Tracks located near the edges of the band are spaced wider apart to reduce adjacent track interference, while tracks near the center can be spaced more closely together. This regional differentiation allows the system to maximize data capacity in the center region while maintaining data integrity in edge regions where interference would otherwise be problematic.
3Adaptability or versatility
If random data writes are performed, then data access flexibility is improved, but magnetic recording uniformity deteriorates leading to increased bit error rates
Solution Approach 1:
The patent applies preliminary anti-action by pre-configuring non-uniform track spacing before random write operations occur. The varied track pitch is designed in advance to counteract the non-uniform magnetic recording effects that will occur during random writes. By having wider spacing at band edges and narrower spacing at the center, the system proactively compensates for the instability that would otherwise be caused by random write operations, thereby maintaining magnetic recording uniformity despite flexible data access patterns.
Data Source
AI summary
A data storage device can employ shingled magnetic recording with data tracks oriented in order to optimize operational parameters, such as bit error rate. A data storage device can consist of a plurality of data tracks overlapping in a band on a data storage medium. First, second, and third data tracks of the band can be respectively separated by a uniform first track pitch during testing the band for an operational parameter. The first track pitch may then be adjusted to provide at least two different adjusted track pitches with each track pitch measured between longitudinal centerlines of adjacent data tracks of the band.