Method for reducing data overhead in PRML data channel
US6366418B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 30, 1999 |
| Grant date | Apr 2, 2002 |
| Priority date | — |
| Expiry date | Jun 30, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/09
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method reducing data format overhead in a storage device. A sequence detector includes a series of states and a path memory of predetermined length. This method includes steps of writing a predetermined shortened pad pattern at the end of a user data field pattern to a signal-degrading storage medium such as magnetic tape or disk; generating samples during read back of the user data field pattern and the shortened pattern; and, controlling the sequence detector during receipt of pad samples to converge at only one or several predetermined detector states during a convergence sequence. The convergence sequence, and the detector pad are shorter than a sequence needed to traverse the entire length of the path memory. The final state reached during the sequence can be used to provide an accurate estimate of a last user data bit of the user data field pattern.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.