Magnetic disk device and method
By introducing a command reordering unit into the disk device, the seek time is accurately estimated using a force constant table and seek curve graph, and the command execution order is optimized, thus solving the problem of extended execution time for multiple commands and achieving efficient command processing.
CN122455019APending Publication Date: 2026-07-24KK TOSHIBA +1
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Patent Information
- Application Number
- CN202510422671.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2025-01-23
- Filing Date
- 2025-04-07
- Publication Date
- 2026-07-24
AI Technical Summary
Technical Problem
In disk devices, existing technologies struggle to efficiently reorder multiple commands, leading to increased overall time, especially when seek time estimates are inaccurate, resulting in increased rotational latency.
Method used
By introducing a command reordering unit into the disk device, and using a force constant table, seek curve chart, and coefficient table, combined with the position and travel distance of the read/write head, the seek time can be accurately estimated, the command execution order can be optimized, and the command with the shortest time can be selected for priority execution.
Benefits of technology
It improves the estimation accuracy of seek time, reduces the total execution time of multiple commands, and achieves efficient command execution.
✦ Generated by Eureka AI based on patent content.
Abstract
The embodiment relates to a magnetic disk device and method. A controller of a magnetic disk device executes a first operation for estimating a seek time for execution of a command for each of a plurality of commands that are not executed. The first operation is an operation that acquires a first force constant and a second force constant and estimates a seek time on the basis of the first force constant, the second force constant, and the seek distance. The first force constant is a force constant of the motor when the magnetic head is located at a start position of a seek operation for commanding execution. The second force constant is a force constant of the motor when the magnetic head is located at an end position of a seek operation for commanding execution. The controller determines a command to be executed first among the plurality of unexecuted commands on the basis of an estimated value of a seek time obtained by the first operation for each of the plurality of unexecuted commands.
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