| 摘要 |
A digital data processing system for transferring digital data from a data channel of the central processor of a computing system or from a temporary storage medium to a high-density laser data recording medium and for nondestructively reproducing the data stored in the high-density medium in a form suitable for transfer to a computer data channel or temporary storage for subsequent use. Input data is transferred into a buffer and control subsystem. This subsystem generates synchronous clock signals and data verification signals which are interleaved with the input data and the composite signal thus produced is recorded on the high-density storage medium. Each recorded bit is checked to insure accuracy of recording at the instant of recording that bit, and remedial action is automatically initiated in the event of error. This remedial action consists of recording a completely unambiguous error indication signal, and re-recording the affected data in such a manner that the final record provides sufficient information to permit correction of all recording errors. During readout the retrieved data is transferred from the high-density storage medium into the buffer and control subsystem for verification of the data. If the data is correct, the synchronous clock and data verification signals are stripped from the output data, the data is reorganized into its original format, and transferred to a computer data channel or other storage medium for subsequent use. If during readout an error is detected, remedial action is automatically initiated before the data is transferred. The buffer and control subsystem includes self-checking diagnostic circuits for detecting and localizing malfunctions in all portions of the high-density data storage and data conversion system.
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