Tape Drive Sync Mark Synchronization via Adjacent Channel
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional tape drive storage systems face capacity reduction due to the need for writing redundant sync marks for error correction, which consume recordable area and reduce tape capacity.
Innovation Solution
The system detects a sync mark from an adjacent read channel to symbol synchronize data, eliminating the need for secondary sync marks and allowing for shorter sync marks, thereby increasing tape capacity and compensating for phase offsets between read channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If redundant sync marks are written for error correction, then reliability is improved, but tape capacity deteriorates
Solution Approach 1:
The patent uses sync marks from adjacent read channels as copies to synchronize the primary read channel. Instead of writing redundant sync marks on the same track, the system reads sync marks from neighboring tracks (adjacent read channels) and uses them to synchronize the primary channel, thereby eliminating the need for additional redundant sync marks and preserving tape capacity while maintaining error correction capability
Solution Approach 2:
The sync marks written on adjacent tracks serve multiple functions: they act as synchronization markers for their own read channels and simultaneously serve as reference sync marks for the primary read channel. This multi-functionality eliminates the need for separate redundant sync marks, resolving the contradiction between reliability and tape capacity
2Measurement precision
If secondary sync marks are written for symbol synchronization, then symbol synchronization accuracy is improved, but sync mark length increases
Solution Approach 1:
The system copies sync mark information from adjacent read channels to achieve symbol synchronization. By reading sync marks from neighboring tracks and using them for synchronization purposes, the system avoids writing extended sync marks, thereby maintaining synchronization accuracy while reducing sync mark length and increasing tape capacity
3Productivity
If multiple read channels operate simultaneously, then productivity is improved, but phase alignment deteriorates
Solution Approach 1:
The system uses feedback from adjacent read channels to maintain phase alignment in the primary read channel. By continuously monitoring and using sync marks from neighboring tracks for synchronization, the system ensures that multiple read channels operate in phase, resolving the contradiction between improved productivity from parallel operations and maintaining precise phase alignment
Data Source
AI summary
A data storage device configured to access a magnetic tape is disclosed comprising a plurality of data tracks. A first head is configured to access a first data track comprising a first sync mark, and a second head is configured to access a second data track comprising a second sync mark. The first head is used to read first data from the first data track, wherein the first data comprises a plurality of symbols, and the second head is used to read the second sync mark from the second data track. The first data is symbol synchronized based on the second head reading the second sync mark from the second data track.