Disk drive employing a multiple-input sequence detector responsive to reliability metrics to improve a retry operation
US6405342B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 10, 1999 |
| Grant date | Jun 11, 2002 |
| Priority date | — |
| Expiry date | Sep 10, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2020/183
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A disk storage system is disclosed employing an improved retry operation. The disk drive comprises a disk for storing a data block, and a head for reading the data block to generate an analog read signal during an initial read operation. A sampler samples the analog read signal to generate a sequence of read signal sample values, and a multiple-input sequence detector detects an initial estimated data sequence from the read signal sample values during the initial read operation. A reliability metrics generator generates reliability metrics representing an estimated reliability for data in the initial estimated data sequence, and the reliability metrics are stored in a local memory. During a retry operation, a memory controller transfers the reliability metrics generated during the initial read operation to the multiple-input sequence detector which generates a retry estimated data sequence using the reliability metrics, whereby the reliability metrics improves the probability of accurately detecting the retry estimated data sequence.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.