Laser Power Adjustment for Equivalent Track Spacing in Heat-Assisted Recording
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In hard disk drives with paired heads writing to different surfaces of a heat-assisted recording medium, achieving equivalent track spacing is challenging, leading to performance penalties due to mismatched track spacings, which complicates simultaneous read/write operations and affects data throughput and reliability.
Innovation Solution
The solution involves adjusting the laser power for paired heads to match their nominal track spacings, allowing them to operate at equivalent track spacings by varying the laser write power, thereby ensuring consistent track spacing across different surfaces, even if one head writes wider or narrower tracks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If paired heads with different nominal track spacings write to different surfaces of a heat-assisted recording medium, then each head can operate at its optimal track spacing, but the track spacing mismatch causes performance penalties and complicates simultaneous read/write operations
Solution Approach 1:
The patent changes the laser power parameter for one of the paired heads to adjust its track spacing. By modifying the laser power, the track spacing of the selected head is adjusted to match the other head's track spacing, enabling equivalent track spacing operation while maintaining the ability of each head to operate at its optimal parameters
2Productivity
If paired heads with different nominal track spacings write simultaneously to different surfaces, then head utilization is maximized, but track alignment and pairing between heads becomes complex
Solution Approach 1:
The patent modifies the laser power parameter of a selected head to change its track spacing characteristics. This parameter adjustment enables the heads to write at equivalent track spacings, simplifying the track alignment and pairing operations while maintaining simultaneous write capability to different surfaces
3Manufacturing precision
If laser power is adjusted for one head to match track spacing, then equivalent track spacing is achieved, but the head's original optimal operating parameters change
Solution Approach 1:
The patent applies parameter changes to the laser power of a selected head, transforming it from a fixed parameter to a variable one. This allows dynamic adjustment of track spacing to match paired heads while maintaining the capability to operate at different parameters as needed, achieving both precision and flexibility
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 enables efficient simultaneous read/write operations on different surfaces by maintaining equivalent track spacings, improving data throughput and reliability by ensuring proper alignment and pairing of tracks between heads.
Implementation Method 1
heat-assisted recording medium
Implementation Method 2
heat-assisted recording medium
Implementation Method 3
write head
Data Source
AI summary
A relatively larger nominal track spacing associated with a first write head is determined and a relatively smaller nominal track spacing associated with a second write head is determined. The first and second write heads simultaneously write to respective different first and second surfaces of a heat-assisted recording medium. A laser write power for a selected one of the first write head and the second write head is changed to enable the first write head and the second write head to operate at an equivalent nominal track spacing.