Hard Drive Accessing Method for Maximum Transmission Rate
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Solution Overview
Problem
The existing hard drive accessing methods reduce the maximum transmission rate to prevent signal phase shift between the controller and the hard drive, leading to performance degradation in mobile devices when transitioning from power saving modes.
Innovation Solution
Establishing an asynchronous access environment through software adjustments allows the hard drive to maintain its maximum transmission rate by ignoring the mode control register values for reading and reducing the controller's transmission rate for writing, ensuring data access at the hard drive's original maximum rate without signal phase shift.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmission rate is reduced to prevent signal phase shift, then system stability is improved, but the hard drive transmission rate performance deteriorates
Solution Approach 1:
The patent changes the transmission rate parameter dynamically based on the access direction. For write operations, it uses a lower transmission rate (e.g., UDMA mode 4 at 66.7 MB/s) to prevent signal phase shift and ensure stability. For read operations, it uses the maximum transmission rate (e.g., UDMA mode 5 at 100 MB/s) to maximize performance. This parameter change resolves the contradiction by adapting the transmission rate to the specific operational context.
2Stability of the object's composition
If the controller and hard drive operate in synchronous access environment, then signal synchronization is maintained, but the maximum transmission rate must be reduced when signal phase shift occurs
Solution Approach 1:
The patent introduces dynamic adaptation of the transmission rate based on the access direction. Instead of maintaining a fixed synchronous transmission rate, the system dynamically selects between different transmission rates (mode 4 for writes, mode 5 for reads) depending on the operational context. This dynamic approach allows the system to maintain signal synchronization when necessary while maximizing transmission rate when possible.
3Use of energy by moving object
If the system enters power saving mode and wakes up to access hard drive, then power consumption is reduced, but signal phase shift occurs causing access errors
Solution Approach 1:
The patent implements preliminary action by pre-configuring the transmission rate based on the anticipated access direction after wake-up from power saving mode. The system determines whether the upcoming access is a read or write operation and pre-sets the appropriate transmission rate before the actual data transfer begins. This preliminary configuration prevents signal phase shift issues from occurring in the first place, ensuring both power efficiency and access reliability.
Data Source
AI summary
A hard drive assessing method and a hard drive assessing system supporting a maximum transmission rate of a hard drive are provided, wherein the hard drive is accessed by a controller, and both the controller and the hard drive support a plurality of transmission rates. The maximum transmission rate of the hard drive is first obtained. When the controller reads data from the hard drive, the transmission rate of the controller is set to be not lower than the maximum transmission rate, and the transmission rate of the hard drive is maintained at the maximum transmission rate. When the controller writes data into the hard drive, the transmission rate of the controller is reduced to be lower than the maximum transmission rate, and the transmission rate of the hard drive is maintained at the maximum transmission rate. Thereby, the hard drive can be accessed at its maximum transmission rate.