Vibration Mitigation in Hybrid Data Storage Devices
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Solution Overview
Problem
Data storage devices with rotating magnetic disks are prone to write errors due to vibrations, which can cause the magnetic head to move off track during data writing, especially in modern systems with high track density.
Innovation Solution
Implementing a Data Storage Device (DSD) with both solid-state memory and a disk, where the controller directs data storage to solid-state memory during vibration conditions to mitigate write errors, and uses throttling and caching to manage data storage capacity effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data is stored on a rotating magnetic disk during vibration, then storage capacity is utilized, but write errors increase due to head movement off track
Solution Approach 1:
The patent extracts the data storage function from the vulnerable rotating disk during vibration conditions and relocates it to solid-state memory, which is immune to vibration-induced head movement. The controller monitors vibration levels and dynamically switches the storage medium, separating the data writing function from the vibration-prone mechanical components.
Solution Approach 2:
The system changes the physical state and location parameter of stored data based on vibration conditions. During normal operation, data resides on the high-capacity rotating disk; during vibration, data is relocated to solid-state memory. This dynamic parameter change allows the system to adapt to varying environmental conditions while maintaining reliability.
2Reliability
If data is redirected to solid-state memory during vibration, then write errors are reduced, but storage capacity is consumed faster
Solution Approach 1:
The patent implements dynamic storage management where the allocation of data between solid-state memory and rotating disk changes based on real-time vibration conditions. The controller continuously monitors vibration levels and adjusts the storage location accordingly, using solid-state memory only when necessary during vibration events, thus optimizing both reliability and storage capacity utilization.
Solution Approach 2:
Instead of permanently allocating all data to solid-state memory during vibration, the system applies partial action by selectively redirecting only the specific data being written at the time of vibration detection. This minimizes the consumption of solid-state memory capacity while still protecting against write errors for critical operations during vibration.
3Quantity of substance
If write commands are throttled during vibration, then storage capacity is conserved, but write speed decreases
Solution Approach 1:
The system applies periodic throttling of write commands during vibration events rather than continuous throttling. The controller monitors vibration conditions and intermittently delays non-critical write operations, allowing critical writes to proceed while conserving storage capacity. This periodic approach maintains better average write performance compared to sustained throttling.
Solution Approach 2:
The patent implements feedback control where the controller monitors vibration levels, storage capacity status, and write command queues, then dynamically adjusts the throttling intensity. When vibration detected and storage capacity is充足, throttling is applied moderately; when capacity is low, throttling is intensified. This feedback mechanism optimizes the balance between capacity conservation and write speed maintenance.
Data Source
AI summary
Vibration mitigation for a Data Storage Device (DSD) including a disk for storing data and a solid-state memory for storing data. An input is received indicating a vibration condition for the DSD and a write command is received from a host to store data in the DSD. At least a portion of the data for the write command is stored in a dedicated segment of the solid-state memory based on the received input indicating the vibration condition.