| 摘要 |
A video recording/reproduction system is equipped with a magnetic disk drive, which records and reproduces video data on a magnetic disk by driving a magnetic head. Herein, the magnetic disk drive is controlled by a CPU in accordance with control programs, while a host machine is provided to perform a variety of controls regarding recording and reproduction in accordance with commands being given by manipulation of an operation panel. The magnetic disk drive is characterized by performing a reassignment process and/or calibration such as to suppress reduction of throughput of video data. That is, if the CPU fails to access a target sector of the magnetic disk so that the target sector is regarded as a defect sector, the CPU makes a decision whether to perform the reassignment process based on transfer speeds and vacant capacity of a buffer memory built in the magnetic disk drive. If transferring data of the host machine overflow the buffer memory by execution of the reassignment process, the CPU temporarily refuges the data to a storage, then, after completion of recording or reproduction, the CPU performs the reassignment process again. Further, the magnetic disk drive performs calibration only when a time margin between a present time and a start time of reserved recording is greater that a calibration time. Thus, it is possible to avoid occurrence of breaks by which pictures being recorded or reproduced are interrupted intermittently. So, it is possible to improve reliability and picture quality in recording and reproduction.
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