Magnetic-disk substrate having a small waviness, for use as a magnetic disk, and a magnetic-disk drive device for use with the magnetic disk

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United States of America Patent

PATENT NO 9865293
APP PUB NO 20170256278A1
SERIAL NO

15603964

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Abstract

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When waviness having a wavelength component of 10 to 500 μm in the circumferential direction of a main surface of a disk-shaped substrate is acquired and slopes are acquired from the waviness at an interval of 50 to 100 μm, the substrate being used in a magnetic disk on which recording or reading is performed using a DFH head, an average value of absolute values of the slopes is 0.45×10−4 or less. This magnetic-disk substrate is used in a magnetic disk and a magnetic-disk drive device.

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Patent Owner(s)

Patent OwnerAddress
HOYA CORPORATIONJAPAN'S TOKYO SHINJUKU FELL 2 CHOME 7 TIMES 5

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kuhara, Takumi Hokuto, JP 2 0
Maeda, Takashi Nirasaki, JP 292 2848

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