| 摘要 |
Embodiments of the present invention help to inhibit record information in a perpendicular magnetic recording disk drive from being attenuated or erased due to leakage of a recording magnetic field into the already-recorded information. According to one embodiment, a magnetic disk includes a soft magnetic underlayer and a magnetic recording layer. A magnetic head includes a main magnetic pole, an auxiliary magnetic pole, a trailing shield which is disposed via a non-magnetic film on a trailing side of the main magnetic pole and in which a reverse side is in contact with the auxiliary magnetic pole, and side shields disposed on both sides of the main magnetic pole. Herein, where a saturation magnetic flux density of the soft magnetic underlayer is BsSUL and a film thickness thereof is tSUL; a saturation magnetic flux density of the trailing shield and side shields is Bsshield and a film thickness thereof is tshield; and the number of sides of the trailing shield and the side shields, which sides oppose the main magnetic pole, is C1, conditions are set so as to satisfy the following expression: <?in-line-formulae description="In-line Formulae" end="lead"?>BsSULxtSUL>(1/C1)xBsshieldxtshield.<?in-line-formulae description="In-line Formulae" end="tail"?>
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