Servo Wedge Skipping for Hard Disk Drive Power Reduction
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Solution Overview
Problem
Data storage devices, such as hard disk drives, consume excessive power and time due to the increasing number of servo wedges, as they read and process servo data from each wedge to maintain proper positioning of read/write heads, leading to high power consumption across components like read/write channels and preamplifiers.
Innovation Solution
The method involves processing data from a first and second servo wedge while skipping the data from a third servo wedge positioned between them, allowing the integrated circuit to operate in a lower power mode, thereby reducing overall power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If data storage devices read and process servo data from each servo wedge to maintain proper positioning of read/write heads, then positioning accuracy is improved, but power consumption increases
Solution Approach 1:
The patent applies the skipping principle by selectively skipping the processing of servo data from intermediate servo wedges during track seeking operations. The system processes servo data from selected servo wedges (e.g., first and second servo wedges) while skipping intermediate servo wedges (e.g., third servo wedge), thereby reducing power consumption while maintaining sufficient positioning accuracy for track seeking.
2Productivity
If the number of servo wedges is increased to support more data tracks, then storage capacity is improved, but power consumption and processing time increase
Solution Approach 1:
The patent applies the extraction principle by extracting only the necessary servo data processing from the complete set of servo wedges. During track seeking operations, the system extracts and processes servo data only from selected servo wedges rather than all servo wedges, reducing power consumption while maintaining the ability to support a large number of data tracks through the remaining servo wedges.
3Reliability
If servo data from all servo wedges is processed, then positioning control is improved, but processing time increases
Solution Approach 1:
The patent applies the skipping principle by rapidly skipping through intermediate servo wedges during track seeking operations. The system processes servo data from selected servo wedges while skipping intermediate ones, thereby reducing processing time while maintaining sufficient positioning control reliability for track seeking applications.
Data Source
AI summary
A method includes processing, via an integrated circuit, data read from a first servo wedge; processing, via the integrated circuit, data from a second servo wedge; and skipping processing data from a third servo wedge positioned between the first servo wedge and the second servo wedge.