Abstract: An apparatus includes a multi-channel DC bus assembly comprising a first channel and a second channel, a first electromechanical device coupled to a positive DC link of the first channel, and a second electromechanical device coupled to a positive DC link of the second channel. A first DC-to-AC voltage inverter is coupled to the positive DC link of the first channel and a second DC-to-AC voltage inverter is coupled to the positive DC link of the second channel. The apparatus further includes a bi-directional voltage modification assembly coupled to the positive DC link of the second channel and a first energy storage system electrically coupled to the first electromechanical device.

Abstract: Adaptively determining shingle guard band widths on at least one disk of a data storage device (DSD). The at least one disk includes a plurality of zones of shingle tracks for storing data. At least one of a magnetic erase width (MEW) and a magnetic read width (MRW) are measured and a shingle track pitch (STP) is determined. The shingle guard band width is determined based at least partly on the STP and at least one of the MEW or the MRW.

Abstract: A perpendicular magnetic write head having improved Bit Error Rate (BER), Adjacent Track Interference (ATI) and Far Track Interference (FTI). The write head includes a write pole and a trailing wrap-around magnetic shield. A permanent magnetic is located at either outer side of the shield. These magnets are magnetized to have magnetizations that are oriented in the same direction, in a direction that is perpendicular to the track direction and parallel with the air bearing surface.

Abstract: A perpendicular magnetic write head having improved Bit Error Rate (BER), Adjacent Track Interference (ATI) and Far Track Interference (FTI). The write head includes a write pole and a trailing wrap-around magnetic shield. A permanent magnetic is located at either outer side of the shield. These magnets are magnetized to have magnetizations that are oriented in the same direction, in a direction that is perpendicular to the track direction and parallel with the air bearing surface.

Abstract: Monitoring the decay of the magnetic domains and refreshing the magnetic domains when the amount of decay has passed an established threshold allows a means to compensate for the superparamagnetic effect and increase the amount of data stored on a recording media. A high frequency reference signal and a low frequency reference signal can be written onto the magnetic media. The low frequency reference signal corresponds to large magnetic bits on the storage media surface, whereas the high frequency reference signal corresponds to small magnetic bits. Because of the large difference in decay rates between the high frequency and low frequency reference signals, any change in the difference of the two signals over time actually reflects the level of signal degradation that has occurred in the high frequency reference signal.

Abstract: Monitoring the decay of the magnetic domains and refreshing the magnetic domains when the amount of decay has passed an established threshold allows a means to compensate for the superparamagnetic effect and increase the amount of data stored on a recording media. A high frequency reference signal and a low frequency reference signal can be written onto the magnetic media. The low frequency reference signal corresponds to large magnetic bits on the storage media surface, whereas the high frequency reference signal corresponds to small magnetic bits. Because of the large difference in decay rates between the high frequency and low frequency reference signals, any change in the difference of the two signals over time actually reflects the level of signal degradation that has occurred in the high frequency reference signal.

Abstract: A lapping guide system, method and article of manufacture is disclosed. A method of fabricating a lapping guide for use in conjunction with the machining of a magnetic recording transducer includes the following steps. A plurality of lap switch fingers of the lapping guide and a bottom pole of the transducer are fabricated at the same time and from the same material. Each lap switch finger has the same topology as the topology of the bottom pole. An insulating layer is fabricated on the plurality of lap switch fingers of the lapping guide and on the bottom pole of the transducer. A top conductor is fabricated on the insulating layer above a plurality of lap switch fingers, while a top pole is fabricated on the insulating layer above the bottom pole. The top conductor and top pole are fabricated at the same time and from the same material.