HDD Sector Replacement via Read Error Detection
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Solution Overview
Problem
Hard disk drives (HDDs) face high annual fault rates due to medium errors, leading to underutilized capacity and reduced operating life, as existing pending sector procedures only rectify errors during write operations, leaving problematic sectors inaccessible during read-intensive periods.
Innovation Solution
A method and system that replace sectors with spare sectors upon read errors, reconstructing data and writing it to the spare sector, even in the absence of write operations, to maintain disk reliability and extend HDD life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the pending sector procedure is only initiated upon write operations, then the system complexity is reduced, but the disk reliability deteriorates during read-intensive periods
Solution Approach 1:
The patent applies preliminary action by proactively replacing pending sectors with spare sectors before they cause complete disk failure. Instead of waiting for write operations to trigger rectification, the system performs replacement during read operations, anticipating potential failures and addressing them in advance. This maintains disk reliability during read-intensive periods without significantly increasing system complexity.
2Loss of time
If problematic sectors are not rewritten during read-intensive periods, then the loss of time for write operations is reduced, but the quantity of usable disk capacity decreases
Solution Approach 1:
The patent implements continuity of useful action by continuously monitoring and replacing pending sectors during read operations. This ensures that sector rectification is an ongoing process rather than being limited to write operations, maintaining both disk capacity utilization and reliability continuously without interrupting normal read/write workflows.
3Reliability
If sectors are replaced with spare sectors upon read errors, then the reliability of the disk is improved, but the device complexity increases
Solution Approach 1:
The patent applies self-service by enabling the disk system to automatically detect, replace, and reconstruct data from pending sectors without external intervention. The system monitors its own health status, identifies problematic sectors during read operations, and autonomously performs replacement and data reconstruction, reducing the need for complex external management mechanisms while improving reliability.
Data Source
AI summary
A method of accessing data stored in a storage disk of a storage system includes the steps of receiving a read operation to a sector of the storage disk and in response to an error returned from the read operation, determining whether the sector is to be replaced. If the sector is determined to be replaced, the method further includes replacing the sector with a spare sector. The data previously stored at the replaced disk sector are reconstructed and written to the spare sector, and the LBA assigned to the replaced sector is reassigned to the PBA associated with the spare sector.