Disc drive error mapping using threshold comparison methods
US4949036A · kind A · utility
49Cited by
1References
32Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 7, 1988 |
| Grant date | Aug 14, 1990 |
| Priority date | — |
| Expiry date | Jul 7, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B27/36
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus and method for testing a variety of hard disk drives is disclosed. The apparatus includes a computer connected to a control board and an interface board. The interface board is connected to a testing board. The hard disk drive is connected to the control board and testing board. The hard disk is tested by first erasing a track of data bits at full write current in one direction or polarity and second erasing the track at minimal write current in the opposite direction. The track is read and compared to a predetermined threshold and any level exceeding the threshold is considered defective.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.