Patent ID: 6934112

Claim:
A method for obtaining magnetic head positions in a magnetic data writing apparatus including (1) a spindle motor having a shaft mounting thereon a plurality of first magnetic disks, to which magnetic data is to be transferred, and a second magnetic disk storing at least in one major surface thereof original disk data including at least one of the magnetic data to be transferred to the first magnetic disks and magnetic data consulted in writing magnetic data to the first magnetic disks, the spindle motor rotating the first magnetic disks and the second magnetic disk as a unit, and (2) a rotary positioner on the periphery of the first and second magnetic disks, the rotary positioner stacking rotatably multiple sets of first magnetic heads, and a set of second magnetic heads for reading the original disk data from the second magnetic disk into a unit, the multiple sets of first magnetic heads including one set assigned to each disk surface of each first magnetic disk, each set of first magnetic heads including a predetermined number of the first magnetic heads for writing magnetic data to the disk surface to which the set is assigned, thereby to cause the first magnetic heads simultaneously to write the magnetic data determined based on the original disk data read out by the second magnetic heads from the second magnetic disk, to respective track ranges assigned thereto on the disk surfaces, the method comprising the steps of: mounting third magnetic disks on the shaft of the spindle motor in place of the first magnetic disks prior to writing magnetic data to the first magnetic disks, the third magnetic disks storing calibration data on the surfaces thereof for facilitating accurate reading by the first magnetic heads of first addresses indicating the position addresses of the tracks and sectors at which the first magnetic heads are present; and reading out second addresses included in the original disk data, by the second magnetic heads from the second magnetic disk, the second addresses indicating the position addresses of the tracks and sectors on the second magnetic disk where the second magnetic heads are present, and reading out the first addresses from the third magnetic disks simultaneously with reading out the second addresses, thereby to obtain relationships between the position address of each second magnetic head and corresponding position addresses of the first magnetic heads.