Multi-Arm Disk Drive Interleaved Seek Control
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Solution Overview
Problem
Current hard disk drives face challenges in reducing average seek time for multiple data transfer requests, as they typically rely on a single armature moving multiple read/write heads, which limits efficiency in handling sequential data transfer operations.
Innovation Solution
A multi-arm disk drive system with interleaved read/write operations, featuring two independent read/write heads and actuator assemblies, controlled by a controller that interleaves seeks and data transfers to maintain the temporal sequential order of requests, allowing for simultaneous or staggered operations to optimize access times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single armature moves multiple read/write heads in unison, then device complexity is reduced, but average seek time increases due to inability to perform simultaneous operations
Solution Approach 1:
The single armature is divided into multiple independent armatures (first armature and second armature), each capable of independent movement and control. This segmentation allows simultaneous seek operations to different tracks, reducing average seek time while maintaining manageable device complexity through modular architecture
Solution Approach 2:
The system transitions from a single-dimensional control approach (one armature moving all heads) to a multi-dimensional approach where multiple armatures operate independently in parallel. This dimensional expansion enables concurrent seek operations across different data surfaces, addressing the time loss issue
2Loss of time
If multiple independent armatures with read/write heads are used, then average seek time is reduced through simultaneous operations, but device complexity increases
Solution Approach 1:
Multiple armatures and read/write heads are merged into a unified disk drive system with integrated controller logic. The controller coordinates seeks and data transfers across all armatures, combining their capabilities to reduce average seek time while managing complexity through centralized control architecture
Solution Approach 2:
Each armature assembly is designed as a universal module capable of performing both seek operations and data transfer operations independently. This multi-functionality allows the system to handle multiple data transfer requests simultaneously without requiring specialized components for each function, balancing performance improvement with complexity management
3Productivity
If multiple read/write heads per surface are used for simultaneous data transfer, then data transfer speed increases, but average seek time improvement is limited due to sequential head selection
Solution Approach 1:
The system performs preliminary seek operations in parallel using multiple independent armatures before data transfer begins. By completing seek positioning for multiple heads simultaneously rather than sequentially, the system reduces the average seek time component while maintaining high data transfer speeds during the actual transfer phase
Data Source
AI summary
A hard disk drive system that includes one or more rotating data storage platters, a drive controller and multiple actuator assemblies and corresponding respective read/write heads. The actuator assemblies are separately moveable for performing separate data seeks. The controller is configured to interleave the seek and read/write operations of the multiple actuator assemblies and read/write heads with one another.