| 摘要 |
PURPOSE:To restrain the lowering of a processing efficiency to a minimum to realize a high reliability dependent upon double recording by recording the same data on two disc devices duplicately and reporting the write end to the upper-level device at a write end time. CONSTITUTION:Receiving a write command, a disc control unit transfers the whole or a part of data to be written to data buffer 3 if the command can be executed. After that, this data is written onto two disc devices A and B which are designated previously and are not rotated synchronously. A signal is sent to write end control circuits 4 and 5 each time write is completed in devices A and B; and when circuits 4 and 5 decides that the write to devices A and B is completed, the write of contents of buffer 3 is regarded as completed. Therefore, write is performed, as it were, to one disc device at the view from software, so that double write is possible without increasing the processing time. |
