Variable Track Widths in HAMR Storage for Areal Density
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Solution Overview
Problem
Heat Assisted Magnetic Recording (HAMR) technologies face limitations in achieving high areal density capabilities due to reduced written size of magnetic bits at high linear densities, necessitating improved designs for increased storage density.
Innovation Solution
Implementing a storage device controller that selects variable written track widths based on write attributes of data, such as frequency and sensitivity, to optimize storage location and track width for enhanced areal density, using techniques like interlaced magnetic recording (IMR) and varying the power of the heat source in HAMR systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HAMR is used to record at increased areal densities, then thermal stability and magnetic anisotropy are improved, but written size of magnetic bits is reduced
Solution Approach 1:
The patent applies local quality by using variable written track widths tailored to specific storage locations. Cache regions use narrower track widths for high linear density storage, while non-cache regions use wider track widths for robust readability, optimizing each region's characteristics for its specific function
Solution Approach 2:
The patent implements dynamics by dynamically selecting written track width based on storage location attributes. The controller adjusts track width parameters according to whether data is being written to cache or non-cache regions, enabling adaptive optimization of areal density and readability
2Productivity
If high linear density recording is used, then areal density capability is increased, but written size of magnetic bits is reduced
Solution Approach 1:
The patent applies local quality by implementing different linear density levels in different radial zones of the storage medium. Inner radius regions use higher linear density with narrower track widths, while outer radius regions use lower linear density with wider track widths, optimizing areal density without sacrificing readability
Solution Approach 2:
The patent uses another dimension by varying track width in the radial dimension of the storage medium. By controlling the radial position-dependent track width, the system achieves variable areal density across different regions, effectively adding a spatial dimension to density optimization
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 allows for increased areal density and improved performance by tuning linear densities and track widths, enabling higher storage capacity and reduced bit error rates, particularly in cache regions and high-performance areas of the storage medium.
Implementation Method 1
locally heating a recording medium to reduce the coercivity of the recording medium so that an applied magnetic writing field can more easily affect magnetization
Implementation Method 2
an applied magnetic writing field can more easily affect magnetization of the recording medium during a temporary magnetic softening
Data Source
AI summary
A storage device controller is configured to select one of multiple written track widths for a storage location based on a write attribute of data to be recorded at the storage location. According to one implementation, the storage device controller is further configured to select a power level for a heat-assisted magnetic recording (HAMR) device based on the write attribute.