Reader Bias Control for Read-While-Write Storage Efficiency
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Solution Overview
Problem
In memory storage devices, switching to read mode after write mode can cause efficiency loss due to the time required for read circuitry to warm up, and enabling reader bias current simultaneously with write operations may shorten the lifespan of transducer heads.
Innovation Solution
Enabling reader bias current at a different time than the reader circuitry, using a serial interface to initiate a read-while-write (RWW) mode by warming up reader circuitry during write operations and activating reader bias current after the write signal has stopped, thus avoiding electrical overstress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If reader bias current is enabled simultaneously with write operations, then read operations can be performed during write mode, but the lifespan of transducer heads is shortened due to electrical overstress
Solution Approach 1:
The reader circuitry is warmed up in advance during the write operation before the actual read operation begins. This preliminary warming up allows the read circuitry to be ready while the write operation is still in progress, enabling faster transition to read mode without requiring simultaneous operation of reader bias current and write signals
Solution Approach 2:
The patent dynamically controls the timing of reader bias current enablement based on the state of write operations. The reader bias current is enabled only after the write signal has stopped alternating, creating a dynamic timing relationship that adapts to the operational state rather than using fixed simultaneous enabling
2Productivity
If switching to read mode after write mode, then read operations can be performed, but efficiency is lost due to warm-up time required for read circuitry
Solution Approach 1:
The reader circuitry is warmed up in advance during the write operation before the actual read operation begins. This preliminary action eliminates the warm-up delay that would otherwise occur when switching from write mode to read mode, as the circuitry is already prepared when the read operation is initiated
Solution Approach 2:
The warming up of reader circuitry occurs continuously during the write operation, maintaining readiness for read operations without interrupting the write process. This continuous preparation ensures that when a read operation is needed, the circuitry is already warm and ready, eliminating idle warm-up time
Data Source
AI summary
Systems and methods are included for determining a presence of an upcoming reading field during a write mode of a storage device, and initiating a read-while write (RWW) mode of the storage device in response to the sensed reading field. Initiating the RWW mode comprises warming up the reader circuitry, generating a signal in response to an end to the write operation, and activating reader bias current in response to the generated signal.