Storage device and method of calculating transfer amount of lubricant
AssigneeToshiba Storage Device Corporation
InventorsHiroyuki KUBOTERA, Takahiro IMAMURA
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Abstract
According to one embodiment, a storage device includes a storage medium and a head slider. The storage medium includes a surface coated with a lubricant. The head slider includes a medium facing surface that faces a surface of the storage medium based on the relative movement to the storage medium. The product ph [atm·nm] of air pressure p [atm] defined between the surface of the storage medium and the medium facing surface and a floating amount h [nm] of the medium facing surface defined from the surface of the storage medium satisfies ph≧0.0129 Mn+71.344 with respect to the molecular weight Mn of the lubricant.
Claims6
A storage device comprising:
- a storage medium comprising a surface coated with a lubricant;
- and
- a head slider comprising a surface facing a surface of the storage medium based on relative movement to the storage medium, wherein
- a product ph [atm·nm] of air pressure p [atm] between the surface of the storage medium and the surface of the head slider and a floating amount h [nm] of the surface of the head slider from the surface of the storage medium satisfies:
- ph≧0.0129 Mn+71.344
- where Mn is a molecular weight of the lubricant.
A method of calculating a transfer amount of a lubricant, comprising calculating a transfer amount of a lubricant on a storage medium to a surface of a head slider based on a product ph [atm·nm] of air pressure p [atm] between a surface of the storage medium and the surface of the head slider and a floating amount h [nm] of the surface of the head slider from the surface of the storage medium.
A head slider comprising:
- a slider body comprising a surface;
- a rear rail at an air outflow end side of the surface, comprising a width of the rear rail in a width direction of the slider body configured to decrease toward an air outflow end from an air inflow end;
- a step surface at an air inflow end side of the rear rail;
- and
- an air bearing surface at an air outflow end side of the rear rail on configured to be connected to the step surface through a step difference, wherein
- at least one of crossing angles between an extension line of a contour of the rear rail at a side of the rear rail and a front-rear direction center line of the slider body is larger than a maximum skew angle.
Dependencies are inferred from the claim text.