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INFORMATION TRANSFERS, READING/WRITING INSTRUCTIONS AND READING INSTRUCTIONS FOR READING AND/OR WRITING INFORMATION BLOCKS
INFORMATION TRANSFERS, READING/WRITING INSTRUCTIONS AND READING INSTRUCTIONS FOR READING AND/OR WRITING INFORMATION BLOCKS
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机译：信息传输，读/写说明以及用于读和/或写信息块的读说明
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摘要
A disc-shaped information carrier has a track thereon which follows a helical or concentric path forming successive windings. For identifying each winding the information carrier also has a servo pattern thereon which includes position-information as well as synchronization elements. Such elements may be, for example, brief pulses in a continuous track wobble, and are distinguishable in adjacent windings based on a predetermined detectable parameter, such as alternating polarity or shifted relative phase positions. During recording by a read/write head a system control detects the synchronization elements and monitors whether a deviation has occurred signifying that the read/write head has wandered to an adjacent winding. In that event recording is interrupted. Thus, the least possible information in adjacent windings is overwritten in the case of disturbances resulting from shocks or defects of the information carrier. A read device is also described which interrupts reading if the winding identification provided by the synchronization elements signifies erroneous operation.
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