System and method for data recovery in multiple head assembly storage devices
US5163162A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 14, 1990 |
| Grant date | Nov 10, 1992 |
| Priority date | — |
| Expiry date | Nov 14, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2020/183
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A systematic method for detecting which head in a multiple head storage device contains errors and may be misaligned, and correcting for misalignment so that the data can be recovered. The apparatus includes a data buffer for storing a block of interleaved data read from the multiple head storage device, status bits, error detection circuitry for determining from the interleaved data, which if any of the heads is misaligned and for setting the status bits, data recovery control logic responsive to the status bits for sending control signals to the multiple head storage device for causing the misaligned head to move its position by small increments and to read data until the status bits indicate that the misaligned head has become aligned, and circuitry responsive to the status bits for writing data from the newly realigned head over the data which was read when that head was misaligned. The method includes steps of reading a block of interleaved data from a multiple head storage device and sending that data to a data buffer; detecting the existence of a misaligned head in determining which head is misaligned; generating error detection signals which indicate which head is misaligne…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.