A data storage apparatus includes a magnetic medium having a top recording layer of hard magnetic material for perpendicularly storing magnetic data and a bottom underlayer of soft magnetic material, a read head for reading magnetic data from a recorded portion of the recording layer, a stabilizer for magnetically stabilizing a portion of the underlayer directly below the recorded portion simultaneously while the read head is reading magnetic data from the recorded portion and the read head and the stabilizer being separate structures.

 
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< Magnetic head, magnetic recording/reproducing apparatus

< Thin film magnetic head with a particularly shaped magnetic pole piece and spaced relative to an MR element

> MR composite-type thin-film magnetic head having an upper pole with a high saturation magnetic flux density and an intermediate pole with a high resistivity

> Alternating-azimuth angle helical track format using grouped same-azimuth angle heads
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