To make a soft magnetic underlayer of a double layered perpendicular magnetic recording medium thinner than heretofore while avoiding saturation. Assuming that T.sub.b1 is the thickness of the soft magnetic underlayer of the double layered perpendicular magnetic recording medium, B.sub.S2 the saturation flux density of the same, T.sub.m the thickness of a magnetic recording head's main pole 1 along a track direction in the vicinity of its floating surface, T.sub.WW the track width of the same, and B.sub.S1 the saturation flux density of the same, then T.sub.b1<(B.sub.S1.times.T.sub.m.times.T.sub.WW)/2(B.sub.S2.times.(T.s- ub.m+T.sub.WW)) is satisfied.

 
Web www.patentalert.com

< Disk drive recursively estimating repeatable runout

< Floppy disk apparatus

> Disk cartridge ejection mechanism and method

> Thin-film magnetic head having a high recording density and frequency

~ 00281