Patent ID: 6917495

Claim:
A magnetic disk drive comprising: a magnetic disk; a spindle motor for rotating said magnetic disk; a magnetic head slider for recording or reproducing data onto or from said magnetic disk; a housing; a control circuit system for controlling said head slider so that said head slider is positioned on a magnetic disk plane when said magnetic disk is rotating, and said head slider is saved to outside the magnetic disk plane when rotation of said magnetic disk is stopped; and lubricant supply means for supplying lubricant to the surface of said magnetic disk; wherein said lubricant supply means contains at least a perfluoropolyether compound having any one of an alcohol group, a cyclic ether group, and an alkyl-ester group at its terminal position as a lubricant, and said lubricant contains said perfluoropolyether compound having a molecular weight sufficient to enable lubrication and no greater than 4000, and wherein said lubricant supply means is at least one of a suspension applied with said lubricant and an arm applied with said lubricant.