Dual-Read Element Servo Burst Positioning for Disk Drives

The patent divides the read function into multiple read elements (first read element and second read element) positioned at different radial locations. Each read element independently reads servo bursts from the disk, allowing the system to segment the servo reading task across multiple physical components. This segmentation enables comparison and confirmation of shock events, improving reliability while managing complexity through functional division.

The patent introduces a shock confirmation mechanism where the second read element acts as an intermediary to verify shock events detected by the first read element. Instead of directly acting on corrupted servo bursts, the system uses the second read element's independent reading as a mediator to confirm whether a shock event actually occurred, preventing false write aborts while maintaining system reliability.

The patent positions the first and second read elements at different radial locations across the disk surface, giving each element a specialized local function. The first read element is optimized for reading servo bursts at its specific radial position, while the second read element serves a similar function at a different radial position. This local quality approach allows each element to be optimized for its specific location, improving overall measurement precision across the entire disk surface.

Both read elements perform the same fundamental function of reading servo bursts and generating position error signals, making them universally applicable across different radial locations. The system uses multiple instances of the same functional unit (read element) rather than completely different mechanisms, which simplifies the overall system architecture while still achieving improved measurement precision through the multi-element configuration.

The patent performs preliminary shock confirmation using the second read element before executing write operations. By having the second read element independently verify shock events in advance, the system can prevent false write aborts caused by corrupted servo bursts. This preliminary action ensures that only genuine shock events trigger write aborts, improving data writing efficiency while maintaining acceptable manufacturing precision requirements.

The system implements a feedback mechanism where the second read element continuously monitors servo bursts and provides confirmation feedback to validate shock events detected by the first read element. This feedback loop allows the system to distinguish between actual shock events and corrupted servo burst readings, improving productivity by reducing false write aborts while managing the precision requirements through continuous verification.