| 摘要 |
PURPOSE:To enable stable operation by changing the inversion interval of a position bit signal of servo information according to change of angle made by the track and head on a magnetic disk. CONSTITUTION:A positioning mechanism 30 positions a head 7 at a specified track on a magnetic disk 1 from a microprocessor 36 through a controlling mechanism 32. The program of the processor 36 is stored in a main memory 39, and operation is performed according to the program. Radial position on the disk 1 and the corresponding optimum magnetizing inversion width are stored in a pair in an ROM35. When the optimum magnetizing inversion width of position bit corresponding to a position at a time when the head 7 is positioned at some point on inner periphery - outer periphery on the magnetic disk 1 is read out from the ROM35 and the position bit is read, writing is made by this value. Consequently, gain of positional signal does not change even when the position of the head changes, and stable operation can be effected. |
