Patent ID: 7016132

Claim:
A magnetic data embedding system, comprising: a spindle motor having a shaft; a master disk mounted on a shaft of the spindle motor, the master disk having magnetic data written on at least one side thereof; a plurality of magnetic disks for receiving magnetic writing, the magnetic disks being integrally mounted in a stack on the shaft of the spindle motor, each magnetic disk having a top side and a bottom side; at least one reading head for reading the magnetic data on the master disk; a plurality of writing heads that are arranged in writing head groups, each writing head group including at least one of the writing heads, the writing head groups being associated with the top and bottom sides of the magnetic disks such that each writing head group has access to a respective one of the sides; and at least one rotary positioner each integrally holding at least one reading head and at least some the groups of writing heads in a pivotable stack, the at least one rotary positioner being disposed adjacent the periphery of the stack of magnetic disks so that at least a plurality of the writing head groups can gain access to the same side of each of the magnetic disks for writing, wherein the writing head groups on the same side of the magnetic disks carry out writing onto said same side in parallel with other writing head groups on said same side of the magnetic disks within respective assigned track ranges, the writing being carried out in response to the magnetic data read out by at least one reading head and modified magnetic data prepared on the basis of the magnetic data.