Magnetic Disk Dynamic Recording Region Allocation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Magnetic disk devices face limitations in maximizing data storage capacity due to the differing radial widths of conventional magnetic recording and shingled write magnetic recording regions, leading to reduced upper limits on data that can be written, as these regions are set on the disk.
Innovation Solution
A magnetic disk device that divides the user data region into non-overlapping conventional and shingled write magnetic recording division regions, allowing for dynamic setting of recording regions based on received commands, minimizing unused space and optimizing data storage by validating and invalidating these regions accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the disk is divided into conventional magnetic recording region and shingled write magnetic recording region with fixed radial widths, then the recording regions can be clearly defined and managed, but the upper limit value of data storage capacity is significantly reduced due to unused space
Solution Approach 1:
The patent applies dynamics by making the division region boundaries adjustable rather than fixed. The controller dynamically determines the radial width of conventional magnetic recording division regions and shingled write magnetic recording division regions based on actual data writing requirements, allowing the regions to adapt and change their boundaries to eliminate unused space while maintaining clear management structure
Solution Approach 2:
The patent changes the parameters of division region radial widths from fixed values to variable values. The controller modifies the radial width parameters of conventional and shingled write magnetic recording division regions according to the specific data storage needs, enabling optimization of space utilization without compromising region definability
2Ease of operation
If the radial width of conventional magnetic recording region is made equal to shingled write magnetic recording region, then the regions can be uniformly divided, but the data storage capacity decreases due to mismatch with actual recording requirements
Solution Approach 1:
The patent makes the division region configuration dynamic by allowing the controller to adjust the radial widths of conventional and shingled write magnetic recording division regions based on actual recording requirements, rather than maintaining uniform fixed widths, thus optimizing storage capacity while preserving operational simplicity through automated control
3Device complexity
If fixed division regions are used for conventional and shingled write magnetic recording, then the region setting is simple, but significant unused space is created reducing effective storage
Solution Approach 1:
The patent resolves this contradiction by implementing dynamic region allocation where the controller automatically adjusts division region boundaries based on data writing commands, eliminating the need for complex manual configuration while maximizing effective storage space through adaptive boundary determination that prevents unused space creation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively minimizes unused space on the disk, thereby suppressing the decrease in data storage capacity and enabling efficient data writing by optimizing the setting of recording regions.
Implementation Method 1
at least one head that writes data to the at least one disk and that reads data from the at least one disk
Implementation Method 2
conventional magnetic recording in which a plurality of tracks is written at intervals in the radial direction
Implementation Method 3
shingled write magnetic recording in which a plurality of tracks is overwritten in the radial direction
Data Source
AI summary
According to one embodiment, a magnetic disk device includes a controller that disposes a plurality of conventional magnetic recording division regions and a plurality of shingled write magnetic recording division regions in the user data region, sets, when receiving a command to write data to a first LBA, a first conventional magnetic recording region to a first conventional magnetic recording division region, and sets, when receiving a command to write data to a second LBA, a first shingled write magnetic recording region to a first shingled write magnetic recording division region.