| 摘要 |
PROBLEM TO BE SOLVED: To provide a write data writing device suppressing a circuit scale and the price of a device and writing fast without waiting time during writing of write data. SOLUTION: As a memory 4 for write data housing write data, two memories, a memory 4-1 for EVEN and a memory 4-2 for ODD, are provided and plural kinds of write data (an area for A and B burst and an area for C and D burst) different from each other are previously stored in the respective memories. Then, each time of moving a head position in the radial direction of a magnetic disk, selection of the memories outputting write data is switched alternately. Then, while write data is outputted from one of the memories, address conversion processing for adding an offset value to the address of the memory is executed and the other memory which does not output write data is accessed to rewrite only the changing part of the already outputted write data. Thus, write data is written speedily without waiting time by a small circuit scale.
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