Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1998-05-15
2000-11-21
Sniezek, Andrew L.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 9702, 360 69, G11B 2102
Patent
active
061511838
ABSTRACT:
The invention relates to a magnetic recording device which can be used at a reduced atmospheric pressure without having the head/slider assembly stick to the disk. A method of the present invention for controlling the operation of a disk drive device in reduced atmospheric pressure where a read/write head mounted on a head support arm flies above the surface of a rotating recording disk. The head support arm is moved along a radial direction of the recording disk to position the read/write head to one of cylinder positions of the recording disk. The method comprises steps of (i) detecting a value of the reduced atmospheric pressure during a power on reset period before a read/write period, (ii) storing information indicating whether the detected value of atmospheric pressure is lower than a threshold value, and (iii) accessing, during the read/write period, the stored information to determine whether an operation for lowering a flying height of the read/write head to a height which is lower than a height for the read/write operation should be inhibited.
REFERENCES:
patent: 5206570 (1993-04-01), Hargarten et al.
patent: 5319509 (1994-06-01), Michelson et al.
patent: 5377058 (1994-12-01), Good et al.
patent: 5764430 (1998-06-01), Ottesen et al.
Ogasawara Kenja
Sai Fuminori
Ueno Shinji
Yoneda Isao
Davidson Dan I.
International Business Machines - Corporation
Martin Robert B.
Sniezek Andrew L.
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