Combination Optical Disc Format Detection via Pre-stored Information
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Solution Overview
Problem
Current optical drives experience long start-up times and unreliable access to combination-format discs, such as those with both CD and DVD layers, due to the inability to detect the presence of multiple formats on the same disc, leading to compatibility issues and incorrect layer selection.
Innovation Solution
Incorporating format information on the disc, such as in a chip, barcode, or Burst Cutting Area, to inform the drive about the presence and type of multiple formats, allowing it to select the correct access method for each layer, thereby enabling quick and accurate identification and access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the drive detects only one format on the disc, then the access method is simple, but the start-up time becomes long and the other format layer may be missed
Solution Approach 1:
The patent applies preliminary action by implementing a format information table that is pre-established and stored on the disc. This table contains format information for multiple layers before the drive attempts to access them. By having this information readily available in advance, the drive can quickly determine which formats are present on the disc without performing lengthy detection routines, thereby reducing start-up time while maintaining simple access methods.
2Productivity
If the drive seeks only to the first detected layer, then the access is fast, but the other format layer is missed
Solution Approach 1:
The patent implements feedback by using the format information table to guide the drive's access behavior. After detecting the formats present on the disc through the table, the drive receives feedback about which layers are available and adjusts its access pattern accordingly. This allows the drive to maintain fast access speeds by directly jumping to the appropriate layer based on the format information, while simultaneously ensuring that multiple format layers are properly accessed rather than missing any.
3Reliability
If different drives use different search methods, then each drive optimizes for its own method, but format detection becomes unreliable across different drives
Solution Approach 1:
The patent applies universality by creating a standardized format information table structure that can be read by any drive, regardless of its specific search method or format. This table serves as a universal interface between the disc and various drives, containing format information in a consistent format that all drives can interpret. This eliminates the reliability issues caused by different drives using different search methods, as they all reference the same standardized information source, while keeping the detection system relatively simple.
Data Source
AI summary
A combination optical disc (1) is disclosed, which contains at least two information layers (10, 11) of at least two different storage formats selected from for example CD, DVD, BD. Information is stored on the disc (1) concerning the storage format of the layers (10, 11). According to an embodiment of the invention, each of the formats contains information indicating that a second, or even third, format is present on the same disc. Now a device may select a Format different from the one detected during start up. Alternatively, all formats present on a single disc are identified by an identifier on the disc. Such art identifier may be located in the BCA area, a chip (4) on disc or in a bar code on the disc itself.