| 摘要 |
PURPOSE:To shorten a seek time and to improve positioning accuracy by providing data buffers storing position correcting amounts and outputting a seek complete signal after the amount is confirmed. CONSTITUTION:A disk 2 is divided into plural blocks through the inner-most cylinder to the outer-most cylinder. Each block is provided with the position correction data buffers 5 and 6 storing the correcting amounts by which the position of a head 1 is corrected. The buffer 5 stores data estimated according to a change in its contents, while the buffer 6 stores data updated at every time the position is corrected in the block concerned. At the time of seek, the head is seeked in the position with a little off-track amount from a specified cylinder with the aid of the buffer 5. Upon the completion of seek, the position of the head is corrected based on the difference between the contents of the buffers 5 and 6 in the block concerned, and the seek complete signal is outputted. Thus the seek time is shortened, thereby improving the positioning accuracy.
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