Storage Processor Areal Density Adjustment for Degraded Read Heads
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Solution Overview
Problem
Magnetic storage devices face performance degradation due to degraded read heads, leading to increased error rates and potential data corruption, which often results in the entire device being replaced rather than being repaired or maintained.
Innovation Solution
A storage processor monitors read error rates and modifies the areal density of degraded read heads to reduce error rates, allowing the device to maintain operation without replacing the entire unit, and can redistribute areal density adjustments across non-degraded heads to maintain storage capacity in arrayed systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the entire storage device is replaced when a read head degrades, then reliability is maintained, but loss of time and cost increase
Solution Approach 1:
The patent segments the storage device into individual read heads that can be independently monitored and adjusted. Instead of replacing the entire device when one read head degrades, the system identifies the specific degraded head and modifies its areal density parameters independently, allowing the rest of the device to continue operating normally.
Solution Approach 2:
The patent applies parameter changes by modifying the areal density of the degraded read head. The storage processor adjusts the areal density parameter of the specific degraded read head to compensate for its performance degradation, thereby maintaining overall device reliability without replacement.
2Reliability
If the entire storage device is replaced when a read head degrades, then reliability is maintained, but device complexity and cost increase
Solution Approach 1:
The storage device performs self-diagnosis and self-repair through the storage processor, which automatically monitors read head performance and adjusts areal density parameters without external intervention. This eliminates the need for manual replacement and reduces system complexity by automating the maintenance process.
Solution Approach 2:
The patent implements feedback mechanisms where the storage processor continuously monitors read head error rates and performance metrics. Based on this feedback, the system automatically identifies degraded read heads and adjusts their areal density parameters, creating a closed-loop maintenance system that reduces complexity compared to manual replacement procedures.
3Productivity
If read error rates are not monitored, then device operation is simple, but data corruption and errors increase
Solution Approach 1:
The storage processor performs self-monitoring of read head performance by tracking error rates and identifying degraded heads automatically. This internal self-monitoring capability ensures data accuracy without requiring external monitoring systems, thereby maintaining simplicity while improving productivity.
4Reliability
If areal density is modified for degraded read heads, then error rates are reduced, but storage capacity may be affected
Solution Approach 1:
The patent applies local quality by modifying the areal density parameter specifically for degraded read heads while leaving other read heads unchanged. This localized adjustment ensures that only the affected portion of the storage system experiences parameter changes, thereby maintaining overall storage capacity while improving reliability for the degraded heads.
Solution Approach 2:
The system dynamically adjusts the areal density parameter based on the operational status of each read head. By changing this parameter only for degraded heads and not for functioning heads, the system maintains storage capacity while improving read error rates for the affected portions of the storage medium.
Data Source
AI summary
Systems, methods, and firmware for operating data storage devices and storage processors are provided herein. In one example, a data storage device is provided. The data storage device includes magnetic storage media configured to store data, read heads configured to read data from the magnetic storage media at associated areal densities, and a storage processor. The storage processor is configured to monitor read error rates of the read heads during operation of the data storage device to identify a degraded one of the read heads, and process at least the read error rates and an areal density of the degraded one of the read heads to modify the areal density of at least the degraded one of the read heads.