Optical Disc Drive Write Failure Recovery via Dummy Data
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
When an optical disc write failure occurs during a writing operation, the optical disc drive system cannot continue writing data, leading to wasted storage space due to the large capacity of modern optical discs, as the new next write address is not updated, preventing further writing operations on the affected disc.
Innovation Solution
A control method that issues a second write command with dummy data and unaffected data files after stopping the first write command upon receiving a write fail message, sets the next write address based on the last completed data block, and records this address to allow continued writing operations, thereby utilizing the remaining storage space efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the optical disc drive stops writing operation when a write failure occurs, then the data integrity is maintained, but the storage space is wasted and further writing operations cannot be performed
Solution Approach 1:
The patent segments the writing operation into multiple independent data files. When a write failure occurs, only the affected data file is marked as incomplete, while other data files remain intact and can be written in subsequent operations. This allows the system to continue utilizing the optical disc without compromising data integrity of successfully written files.
Solution Approach 2:
The patent implements preliminary error detection and handling mechanisms by checking write status after each data file is transmitted to the optical disc. When a write failure is detected, the system immediately stops further writing operations and marks only the incomplete data file, preventing potential data corruption while preserving the ability to continue writing other files.
2Loss of substance
If the optical disc drive continues writing operations after a write failure, then storage space is utilized efficiently, but data integrity may be compromised
Solution Approach 1:
The patent creates a copy of the incomplete data file's write status information in the lead-in area of the optical disc. This allows the system to track which data files have been successfully written and which are incomplete, enabling safe continuation of writing operations while maintaining data integrity through accurate status tracking.
Solution Approach 2:
The patent implements a feedback mechanism where the system continuously monitors write operation status and updates the lead-in area with the latest write status. This feedback loop enables the system to make informed decisions about whether to continue or stop writing operations, balancing storage space utilization with data integrity.
3Reliability
If the system marks all data files as incomplete after a write failure, then data integrity is maintained conservatively, but productivity is reduced due to wasted storage space
Solution Approach 1:
The patent applies local quality by marking only the specific data file that experienced write failure as incomplete, while leaving other data files with their actual write status. This localized approach to error handling maintains data integrity for successfully written files while enabling continued writing operations, thereby improving productivity without compromising reliability.
Solution Approach 2:
The patent changes the parameter of write status tracking from a global state (all files marked incomplete) to a per-file state (individual files marked as complete or incomplete). This parameter change enables more granular control over writing operations, allowing the system to continue writing unaffected files and improving overall writing efficiency.
Data Source
AI summary
A control method of an optical disc drive system is provided. Firstly, a first write command is issued to burn a first write data including plural data files to an optical disc in an optical disc drive. If a write fail message from the optical disc drive is received after a specified data block of a specified data file is transmitted to the optical disc drive, the transmission of the first write data is stopped. Then, a data amount of the specified data file that has not been transmitted to the optical disc drive is calculated, and a dummy data with the data amount is generated. Then, the dummy data and the other data files that have not been transmitted are burnt to the optical disc.