Method and its apparatus for inspecting a magnetic disk
US8295000B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 25, 2011 |
| Grant date | Oct 23, 2012 |
| Priority date | — |
| Expiry date | Apr 28, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/2516
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In order to implement efficient read/write testing by firstly determining read/write test area-sampling positions based on position information relating to any defects detected during optical inspection, and then conducting read/write tests only upon areas neighboring the defects detected during the optical inspection, a magnetic disk to be inspected is retained on a spindle and moved under this state between an optical type of inspection apparatus and a read/write test apparatus, in which apparatus configuration the read/write test apparatus uses position information on any defects detected by the optical type of inspection apparatus and conducts read/write tests only upon neighboring areas of the defects detected by the optical type of inspection apparatus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.