Disk Drive Media Mapping with Artificial Defects
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Solution Overview
Problem
Data storage devices face increased latency due to physical defects on disk surfaces, which can lead to heightened access times during read and write operations, especially when these defects are included within data containers.
Innovation Solution
The control circuitry of a disk drive detects physical defects and designates adjacent artificial defects to exclude them from data containers, thereby maintaining minimal latency and maximizing speed by ensuring data containers are free of large physical defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If data containers are assigned to include sectors with physical defects, then storage capacity is maximized, but access latency increases
Solution Approach 1:
The patent segments the disk surface into distinct regions by introducing artificial defects that create boundaries between data containers. These artificial defect regions act as separators, ensuring that physical defects are confined to specific zones and do not propagate across container boundaries, thereby preventing latency increases while maintaining storage capacity.
Solution Approach 2:
Artificial defects serve as intermediary elements between data containers and physical defects. By placing artificial defects adjacent to physical defects, the system creates a buffer zone that isolates the harmful effects of physical defects from data containers, allowing containers to remain defect-free while still utilizing maximum storage space.
2Loss of time
If artificial defects are designated adjacent to physical defects, then access latency is reduced, but storage capacity decreases
Solution Approach 1:
The patent applies local quality by introducing artificial defects only in specific locations adjacent to physical defects, rather than uniformly across the entire disk surface. This localized approach creates defect boundaries precisely where needed to protect data containers, minimizing the impact on overall storage capacity while effectively reducing access latency in critical areas.
3Speed
If physical defects are excluded from data containers, then access speed is maximized, but media utilization decreases
Solution Approach 1:
The patent converts the harmful effect of physical defects into a beneficial structure by using them as anchors for artificial defect placement. The artificial defects created adjacent to physical defects serve as useful boundaries that organize the media into efficient container assignments, transforming the presence of defects from a liability into a structural feature that enhances access speed while maintaining high media utilization.
Data Source
AI summary
Various illustrative aspects are directed to a data storage device, comprising one or more disks; an actuator arm assembly comprising one or more heads, and configured to position the one or more heads proximate to disk surfaces of the one or more disks; and one or more processing devices. The one or more processing devices are configured to detect one or more physical defects on a recording medium; designate, in a mapping of the recording medium, the one or more physical defects for exclusion from being assigned to data containers, the data containers configured for assignment of a plurality of logic blocks to the data containers, the logic blocks configured to store the data to be written that are being interleaved across a plurality of sectors based on a distributed sector encoding scheme; and designate one or more artificial defects adjacent to the one or more physical defects for exclusion from being assigned to the data containers in the mapping.