Servo Frame Encoding for Magnetic Disk Format Efficiency
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Solution Overview
Problem
Conventional magnetic disks face challenges in maintaining format efficiency due to the need for increased servo frames, which lengthen data length and lower reliability, especially when recording gray and sector information.
Innovation Solution
The method involves rearranging serial bits of sector and track information to generate an exclusive logical sum, which is then recorded in the servo frame, reducing data length and improving format efficiency and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of servo frames is increased to raise servo sample rate, then servo positioning accuracy is improved, but format efficiency of the magnetic disk is lowered
Solution Approach 1:
The patent combines sector information and track information into a single encoded field within the servo frame. By merging these two types of information and applying compression encoding, the total data length is reduced, allowing more servo frames to be accommodated on the disk without sacrificing format efficiency.
Solution Approach 2:
The patent changes the encoding parameters of the servo information by applying bit rearrangement and compression algorithms. This transforms the original long-bit-length sector and track information into a more compact representation, enabling higher servo frame density while maintaining the required positioning precision.
2Loss of information
If the data length of servo frame is increased to record complete gray and sector information, then information completeness is improved, but format efficiency is lowered
Solution Approach 1:
The patent extracts only the essential bits of sector and track information needed for servo positioning, removing redundant data. By selectively retaining only the critical information components and discarding unnecessary bits, the data length is shortened while maintaining sufficient information for accurate servo operation.
Solution Approach 2:
The patent applies bit rearrangement and compression encoding to transform the information representation. This changes the parameter structure of the stored data, achieving a more compact form that preserves all necessary information with fewer bits, thereby improving format efficiency without losing completeness.
3Adaptability or versatility
If conventional encoding is used for servo address, then compatibility is maintained, but storage space is wasted
Solution Approach 1:
The patent changes the encoding parameters by applying bit rearrangement and compression algorithms to the servo address information. This transforms the conventional encoding into a more space-efficient representation that uses fewer bits to store the same addressing information, thereby reducing storage space consumption while maintaining compatibility through standardized decoding procedures.
Data Source
AI summary
A servo-frame recording apparatus includes: a sector information rearranging section for rearranging serial bits of the sector information that is binary data; a first ExOR section for performing the ExOR (exclusive OR) on the sector information, the serial bits of which have been rearranged by said sector information rearranging section, and the track information, so that an exclusive logical sum is obtained; and a writing section for wiring the exclusive logical sum obtained by said ExOR section into the servo frame. With this configuration, a data length required for recording gray information and sector information can be shortened without lowering the reliability of a magnetic disk.