Data storage device with data recovery process using fixed phase clocking for analog-to-digital conversion
US7733591B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 18, 2006 |
| Grant date | Jun 8, 2010 |
| Priority date | — |
| Expiry date | May 24, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2020/1062
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The invention includes apparatus and methods that allow a data storage device perform an enhanced data recovery procedure (DRP) that includes obtaining a new digital sampling of the voltages for the failing unit of data by re-reading the analog signal and converting it to digital form using an analog-to-digital conversion (ADC) using a fixed phase clock signal. The data samples are re-interpolated using a programmable delay line. The digital values representing the voltages are stored a buffer so that the data can be processed repeatedly using varying parameters as part of the data recovery procedure. Optionally the samples stored in the buffer can be processed in the reverse direction (from end of sector to beginning of sector) without requiring modification of the standard Viterbi detector since it inherently works on data processed in either direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.