Patent ID: 7773333

Claim:
A method for recording data simultaneously at two different depths of a tilted magnetic medium, said tilted magnetic medium having a hard axis of magnetization, said axis being out of a plane of said medium and at an angle of −10 to −80 degrees with respect to a direction along which data are recorded, said medium being capable of having two depths of recording, comprising the steps of: selecting writing magnetic fields to simultaneously write data at said two different depths of the tilted magnetic medium; writing with said selected writing magnetic fields at least a first datum and a second different datum simultaneously at respective said two depths within said tilted magnetic medium; and in which amplitudes of said selected writing magnetic fields and angles of said selected writing magnetic fields with respect to said hard axis direction of said tilted magnetic medium differ at said respective two depths of said magnetic medium such that the recorded direction of magnetization at said respective two depths can be set independently; wherein said selected writing magnetic fields comprise four writing magnetic fields generated by four write currents with respect to a magnetic write head, said write currents comprising two write current amplitudes, a first and a second write current amplitude, and each write current amplitude having two polarities, a positive polarity and a negative polarity; wherein said first and said second write current amplitudes are selected from three write current amplitudes, that include an amplitude (I 2 ) intermediate the other two (I 1 , I 3 ); and wherein said first write current amplitude is selected from (I 1 , I 3 ) to provide writing field angles with respect to said tilted magnetic medium hard axis to write in the same direction at both depths of said tilted magnetic medium, and said second write current amplitude (I 2 ) is selected to provide writing field angles with respect to said tilted magnetic medium hard axis to write in opposite directions at said two depths of said tilted magnetic medium.