Magnetic disk controller capable of avoiding erroneous write operation.

摘要

In a sector mark waiting state (SMW = "1"), when a sector mark detecting signal (SMD) is input to a magnetic disk controller (1', 1''), the magnetic disk controller initiates a write operation of sector data on a magnetic disk. In a non-sector mark waiting state (SMW = "0"), when a sector mark detecting signal (SMD) is input to the magnetic disk controller, the magnetic disk controller stops the write operation of sector data upon the magnetic disk being performed. <IMAGE>