Patent ID: 7428115
Filing Date: 2008-09-23
Classification: G11B

Abstract:
1. A magnetic hard disk drive, comprising: a recording medium including a soft magnetic layer and recording magnetic layer, a read/write head having a write head and a read head, a medium driving part driving said recording medium, an actuator moving said read/write head on said recording medium, and a signal processing circuit being connected to said read/write head, wherein said signal processing circuit has an operation mode generating a DC magnetic field from said read/write head during a reproducing operation; wherein said read/write head comprises a single magnetic pole type write head which has a main pole, an auxiliary magnetic pole, and an excitation coil to generate a recording magnetic field from said main pole interlinking with a magnetic circuit having said main pole and auxiliary magnetic pole, said read/write head comprises a magnetic field generating coil not interlinking with a magnetic circuit that includes said main pole and said auxiliary magnetic pole, said DC magnetic field is generated by energizing said magnetic field generation coil.