Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Drum record
Patent
1994-01-03
1995-07-25
Wolff, John H.
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Drum record
360 9703, G11B 560, G11B 3314, G11B 2504
Patent
active
054367760
ABSTRACT:
In a magnetically recording disk system according to the present invention, rotation of the disk generates a higher air pressure (n atm.) at the gap between the slider supporting a head thereon and the disk surface than the ambient air pressure so as to float the slider from the disk surface. A partial pressure of a vapor recalcitrantly released, by heat of the operation of the disk, from an organic material, such as silicone, constituting the recording disk system, is kept lower than 1
of saturated vapor pressure of the released material. The head slider may be provided with a heater to heat the slider during the disk rotation warmer than the ambient air temperature, preferably by 3.degree. to 15.degree. C. higher at the air gap, so that the saturated vapor pressure can be higher at the air gap than without the heating. An enclosure containing the disk, the head/slider and other constituent members is preferably provided with ventilation holes, a first one on which is provided on a side radial to the disk, and a second one on a side axial to the disk, so that the released vapor is exhausted by radial air flow caused from the disk rotation. There is no head crash resulted from a deposition or vapor recalcitrantly released from silicone, on a slider surface facing the disk. Accordingly, highly reliable magnetic disk system of enhanced recording density is achieved owing to the decreased air gap.
REFERENCES:
patent: 4734803 (1988-03-01), Nishihira
patent: 4814908 (1989-03-01), Schmitz
patent: 4837648 (1989-06-01), Yamauchi
patent: 5030260 (1991-07-01), Beck et al.
patent: 5075807 (1991-12-01), Inoue et al.
Patent Abstracts of Japan, vol. 8, No. 265 (P-318) (1702), Dec. 5, 1984, & JP-A-59 132 459, Jul. 30, 1984.
Patent Abstracts of Japan, vol. 11, No. 45 (P-546), Feb. 10, 1987, & JP-A-61 214 173, Sep. 24, 1986.
Tribology and Mechanics of Magnetic Storage Systems, vol. V (Oct. 1988).
Tribology and Mechanics of Magnetic Storage Systems, vol. VII (Oct. 1990).
"The Head Crash Induced by Liquefaction of Gases", J. Appl. Phys. 69 (8), Apr. 15, 1991.
Evans Jefferson
Fujitsu Limited
Wolff John H.
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