| 摘要 |
PURPOSE:To prevent data missing by reporting a record address relating to a data whose write is finished to a host device after the write to a buffer storage device is finished and then after the write to a connected external storage device is finished. CONSTITUTION:When the write to a series of data buffer storage circuit 23 transferred from a host device 10 by a write instruction is finished, a microprogram control circuit 21 applies end report of a write instruction to the host device 10. The record number of the record which finished the write to an external storage device 32 is added to the end report. The host device 10 aborts the data relating to the record which is before the completion of write reported by the record number added to the end report. In other words, the data relating to the record whose write is not finished to an external storage device 32 is preserved in the host device 10. Thus, the data missing is prevented.
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