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1. (WO2018042511) METHOD FOR RESMOOTHING MAGNETIC DISK

Pub. No.:    WO/2018/042511    International Application No.:    PCT/JP2016/075306
Publication Date: Fri Mar 09 00:59:59 CET 2018 International Filing Date: Wed Aug 31 01:59:59 CEST 2016
IPC: G11B 23/50
G11B 5/84
Applicants: DIGITAL DATA SOLUTION INC.
デジタルデータソリューション株式会社
Inventors: KUMAGAI Masashi
熊谷 聖司
Title: METHOD FOR RESMOOTHING MAGNETIC DISK
Abstract:
Provided is a method for resmoothing a magnetic disk to retrieve data recorded on a damaged data disk. The method comprises: a determination step for determining the height of a bulge around the damaged surface of the magnetic disk; a grinding step for grinding the magnetic disk by a grinding amount in accordance with the height of the bulge determined by the determination step; a step for applying a fluorine-based synthetic lubricant to the damaged surface of the magnetic disk and fixing the lubricant thereon; a cleaning step for spraying ethanol and a diluted solution of the fluorine-based synthetic lubricant onto the magnetic disk while rotating the magnetic disk at high speed to spread the ethanol and the diluted solution of the fluorine-based synthetic lubricant over the entire surface of the magnetic disk by centrifugal force while blowing away an excess amount from the circumferential edge of the magnetic disk; and a resmoothing step for repeatedly performing a seek operation that moves a varnish head across the surface of the magnetic disk set on a glide height inspection apparatus, thereby smoothing fine irregularities that remain on the surface of the magnetic disk while removing dust on the magnetic disk.